A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

Evaluate the expression below when x = -1. 2x2 − 5 x + 9

  • This Question is Open
  1. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    somebody help me please

  2. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    please help me and sheppard18 these questions is what we are depending on to graduate

  3. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ??

  4. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ??

  5. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    hello??

  6. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    replace x by -1

  7. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    is that the answer

  8. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    nope

  9. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    whats the answer

  10. confluxepic
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Just substitute it.

  11. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \[2(-1)^2 -5\] substitute value and then solve !

  12. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i dont know how to substitute because we have never ever had a half decent math teacher

  13. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \(\color{blue}{\text{Originally Posted by}}\) @Nnesha \[2(-1)^2 -5\] substitute value and then solve ! \(\color{blue}{\text{End of Quote}}\) like this just replace x and plug -1 now solve what is square of (-1) ?

  14. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    (-1)^2 is same as -1 times -1 = what ?

  15. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i dont know what the answer is

  16. confluxepic
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    For example x=12. 3(x)+2=y 3(12)+2=y <--------------------------------- 36+2=y | 38=y | | See how I substituted x as 12 to solve the example equation? -------

  17. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    what is -1 times -1 = ??

  18. confluxepic
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Arrow line messed up.

  19. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    -1?

  20. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    negative times negative = positive negative times positive = negative so negative 1 times negative 1 = ?

  21. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    @sheppard18 what do you think ? -1 times -1 = ??

  22. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    1?

  23. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yes right

  24. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    1 is not a choice

  25. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \[2(-1)^2 -5\] \[2(1)-5 =what ??\]

  26. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    i didn't say one is the answer

  27. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    -7/8, -3/8, -1/8, -1 theses are the choices we have

  28. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    -3?

  29. confluxepic
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Example: x+2=y You know that x is 1 but you need to find out y. So you put \(\color{red}{x~as~1}\) in the equation. \(\color{red}{(1)}\)+2=y. 1+2=3 so y=3. Get it?

  30. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yes that's right! remember PEMDAs rule Parentheses exponent MD) MULTIPLY OR DIVIDE AS ) ADD OR SUBTRACT

  31. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    please just tell me the answer

  32. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    were from tug valley we dont know much

  33. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    you have to learn in order to know something

  34. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    are teacher does nothing but sleep in class

  35. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    and calls the office on our class because our class is so mean

  36. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    alright thanks for joining os here we will teach u no direct answers!!

  37. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    well how do i do it

  38. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \(\color{blue}{\text{Originally Posted by}}\) @estepp33 -3? \(\color{blue}{\text{End of Quote}}\) yes right

  39. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    what about -3

  40. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    substitute given x value which is -1 \[\huge\rm 2(-1)^2 -5 \] take square of -1 which is 1 (-1 times -1 = 1) \[2(1)-5 = ???\]

  41. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    that comes out to be -3 what do we do with the -3

  42. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    that's the answer of first one

  43. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    i guess your question is \[\frac{ 2x^2 -5 }{ x+9 }\] right it's a fraction ?

  44. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    it will be a fraction or a whole numbner

  45. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes its a fraction i need help with the bottom now

  46. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    so why you didn't tell me ?? use */* for fraction so we know it's a fraction

  47. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    i thought those are 2 different expression

  48. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \[\huge\rm \frac{ 2\color{blue}{x^2} -5 }{ \color{blue}{x}+9 }\] just like we did before replace x by -1

  49. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    would the answer be -3/8

  50. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    that's right

  51. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i got 8

  52. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yes the denominator is 8

  53. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    can u help me with this question The simplest form of the expression 4m−17m2−16+3m−11m2−16 has in the numerator and in the denominator.

  54. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    and how do i know what is in the numerator and what is in the denominator use the equation and type ur question

  55. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i dont know

  56. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    what ?

  57. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \[\huge\rm 4m−17m^2−16+3m−11m^2−16\] like this ?

  58. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    4m-17/m^2-16+3m-11/m^2-16

  59. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    that is the fraction ^

  60. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    4m-17/m^2 this is the fraction

  61. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \[\huge\rm \frac{ 4m-17 }{ m^2 } -\frac{ 16+3m-11 }{ m^2 -16 }\] like this ?

  62. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yea

  63. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    m^2-16 on both bottom sides

  64. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \[\huge\rm \frac{ 4m-17 }{ m^2 -16} -\frac{ 16+3m-11 }{ m^2 -16 }\] looks good ?

  65. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes

  66. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    no

  67. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    alright type your question please

  68. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    4m-17/m^2-16 + 3m-11/m^2-16

  69. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    the minus sign should be plus and the 16 on top on the right shouldnt be there

  70. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \[\huge\rm \frac{ 4m-17 }{ m^2 -16} +\frac{ 3m-11 }{ m^2 -16 }\] find common denominator? what is common denominator ?

  71. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    16

  72. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    16?

  73. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ??

  74. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    1not just 16 m^2 -16 should be together \[\huge\rm \frac{ }{m^2 -16 }\] so m^2 and -16= common denominator

  75. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok what do i do

  76. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    now bec denominator of both fraction are same as common denominator so just carry down the value of numerator \[\huge\rm \frac{ 4m-17+3m-11 }{ m^2 -16 }\] now combine like terms 4m-17+3m -11= what ?

  77. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    -21

  78. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    how did yo uget -21 ?

  79. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i done 4-17+3-11

  80. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    what are LIKe terms ?

  81. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    you can't combine 4m with -17 bec there are not the same

  82. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    3 and 4

  83. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    add coefficient of same variable yes right 3m and 4m combine them

  84. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    3m+4m =what ? -17-11= ?

  85. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    7 and -28

  86. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ??

  87. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \[ \huge\rm \frac{ 7m -28 }{ m^2 -16 }\] now factor 7m-28 what is common factor ?

  88. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    nd apply difference of square for the denominator part \[\rm a^2 - b^2 = (a+b)(a-b)\]

  89. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    what do i do with that

  90. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    alright first factor the numerator 7m-28 what is common factor ?

  91. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    is it m+4

  92. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ??

  93. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    for which one ?

  94. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    the right one

  95. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    alright 7m-28 what is common in these both terms ??

  96. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    i got to go im going home

  97. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    thanks for the help

  98. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    we have drop down menues

  99. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    menu

  100. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    7m -28 7 is common so take it out \[7( ????)\] now divide both terms by 7 and write your answer in the parenthses

  101. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    is the answer m+4

  102. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    nope not just m+4

  103. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    m^2 -16 = w hat ?

  104. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ?

  105. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    m^2 -16 what are factor of this equation

  106. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    it said error

  107. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    apply difference of square method \[\huge\rm a^2 -b^2 = (a+b)(a-b)\]

  108. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    what ? who said error ?

  109. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    apply difference of square method \[a^2 -b^2 =(a+b)(a-b)\]

  110. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    the caa

  111. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    calculator

  112. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    don't use calculator take square root of first term and 2nd term |dw:1434382762154:dw|

  113. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ?

  114. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Take square root of first term and take square root of 2nd term write ur answer in both parentheses (sqrt of 1st term PLUS sqrt of 2nd term) (sqrt of 1st term - sqrt of 2nd term ) example |dw:1434382868450:dw|

  115. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    (m+1) (2-6)

  116. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    that's an example m^2 - 16 = what ??

  117. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    idk

  118. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    difference of square method have to when both terms are perfect square root and there should be negative sign for example x^2 - 36 1st term =x^2 2nd term =36 square root of first term is =x square root of 2nd term is = 6 now write these in parentheses|dw:1434383072396:dw|

  119. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.