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careless850

  • 2 years ago

Can someone please explain and show me how to do these please. 1.) x^2 – 8x + 15 2.) a^2 – a – 20 3.)a^2 – 5a – 20 4.)a^2 + 12ab + 27b^2 5.)2a^2 + 30a + 100

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  1. careless850
    • 2 years ago
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    @Roya Could you help me?

  2. careless850
    • 2 years ago
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    Anyone?

  3. dpaInc
    • 2 years ago
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    all of 'em?

  4. Roya
    • 2 years ago
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    dear i 'll . u need to find out x and a ?

  5. careless850
    • 2 years ago
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    Yes please. Well, yeah. :/ It's factoring trinomials.

  6. careless850
    • 2 years ago
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    Instructions say --> Factor each trinomial below. Please show your work

  7. Roya
    • 2 years ago
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    x^2-8x+15=0 (x-3)(x-5)

  8. Roya
    • 2 years ago
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    for ex for this one think about two numbers which their multiple product be 15 and their product of sum be -8

  9. Roya
    • 2 years ago
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    we know that 3*5 is 15 and we check if the some of them is -8 or not ? 5+3=8 but with a little experience we guess -3+-5=-8

  10. careless850
    • 2 years ago
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    I see.

  11. Roya
    • 2 years ago
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    20=10*2 10*2=8 10-2=8 20=5*4 5+4=9 5-4=1 4-5=-1 so can u find out the factors ?

  12. careless850
    • 2 years ago
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    10 and 5

  13. Roya
    • 2 years ago
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    u mean (a-10)(a-5) ?

  14. careless850
    • 2 years ago
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    Wait, which one are we on?

  15. careless850
    • 2 years ago
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    The second one?

  16. Roya
    • 2 years ago
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    second

  17. careless850
    • 2 years ago
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    I'd say the factors would be -10 and -5.

  18. Roya
    • 2 years ago
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    look at what i wrote before . 4-5=-1 4*-5=-20

  19. careless850
    • 2 years ago
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    (a-1) (a-10)

  20. careless850
    • 2 years ago
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    not -10 I meant a-1 * a-20

  21. Roya
    • 2 years ago
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    a^2-11a+10 is it ur equation ?

  22. Roya
    • 2 years ago
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    a^2-21a+20 is it ur equation

  23. careless850
    • 2 years ago
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    So confusing. :/

  24. Roya
    • 2 years ago
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    don't be confuse it's need just practice . look at what i done

  25. Roya
    • 2 years ago
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    for second one as i wrote before the answer is : a-5*a+4

  26. careless850
    • 2 years ago
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    ok..

  27. Roya
    • 2 years ago
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    i think the third one is not correct but let's check forth one :

  28. careless850
    • 2 years ago
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    The question for #2 is, a^2 – a – 20. So, I have to find the product of -a and the sum of -20, right?

  29. careless850
    • 2 years ago
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    All those up top are questions, I have to factor all of them.

  30. Roya
    • 2 years ago
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    u know (a+b)^2= a^2+2ab+b^2 can u guess what we should put in my equation instead b ? because u see that first term didn't change

  31. Roya
    • 2 years ago
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    ok i solve num 3 as well but first the easier

  32. careless850
    • 2 years ago
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    Let's do #2, again.

  33. careless850
    • 2 years ago
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    a^2 – a – 20

  34. Roya
    • 2 years ago
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    ok

  35. careless850
    • 2 years ago
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    What would I do first?

  36. Roya
    • 2 years ago
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    for factories as i remember we have some ways can u tell me the ways ?

  37. careless850
    • 2 years ago
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    Find the product of one and the sum of another.

  38. Roya
    • 2 years ago
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    plz tell me all the method

  39. careless850
    • 2 years ago
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    I don't know..

  40. Roya
    • 2 years ago
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    one is (x+b)(x+a)=x^2+(a+b)+ab that's what u mentioned .

  41. Roya
    • 2 years ago
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    fortunately we can solve #2 with this : so look at 20 tell me product of which numbers make 20?

  42. careless850
    • 2 years ago
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    10*2

  43. careless850
    • 2 years ago
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    and 1- - 2 = 8

  44. careless850
    • 2 years ago
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    10 - 2 = 8

  45. careless850
    • 2 years ago
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    so 10 and 8?

  46. Roya
    • 2 years ago
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    look at our formula coefficient of x is equal to sum of the numbers , am i correct ?

  47. careless850
    • 2 years ago
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    Yse.

  48. Roya
    • 2 years ago
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    ok now tell me is the sum of 10 and 2 equal to -1 ?

  49. careless850
    • 2 years ago
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    10 + 2 = 12. 12 + (-13) = -1

  50. Roya
    • 2 years ago
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    dear now what's ur number ? check them

  51. careless850
    • 2 years ago
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    The sum of 10 and 2 is 12, right?

  52. Roya
    • 2 years ago
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    yes

  53. careless850
    • 2 years ago
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    Okay, so the sum of 10 and 2 isn't -1.

  54. careless850
    • 2 years ago
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    ....

  55. Roya
    • 2 years ago
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    dear don't be confuse . may i know what's ur grade ? high school ?

  56. careless850
    • 2 years ago
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    9th.

  57. Roya
    • 2 years ago
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    where r u from ?

  58. careless850
    • 2 years ago
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    I just need to complete these 5 questions for my assignment or I get kicked out of my class. I'm from USA.

  59. Roya
    • 2 years ago
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    dear i'm here till tomorrow morning and i'll help u . u r just 16 years old . never mind dear no one kick u out

  60. Roya
    • 2 years ago
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    lets learn it again with each other ok ? ready ? fasten ur seat belt

  61. careless850
    • 2 years ago
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    I'm 17. I've failed Algebra 3 times. I just don't understand it. I'd be graduated by now if it wasn't for Algebra.

  62. Roya
    • 2 years ago
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    u r a genius . may i know ur name ?

  63. careless850
    • 2 years ago
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    Possibly. What's yours?

  64. Roya
    • 2 years ago
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    dear algebra is sweet if u touch it and guess it .

  65. Roya
    • 2 years ago
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    my name is roya . i'm iranian and i'm 21 . i'm electrical engineering student and mu=y name means dream . any thing else ? i'm a girl

  66. careless850
    • 2 years ago
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    Ha. I'm a boy, 17 the name is Dylan and I'm from Florida.

  67. Roya
    • 2 years ago
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    ok are u ready ?

  68. careless850
    • 2 years ago
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    My name is Careless because eeveryone calls me that and I don't care about anything but computers and programming and processing. Yes, I'm ready. Let's start with #2... again. please.

  69. Roya
    • 2 years ago
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    dear look at # 2 . and compare it with our formula a^2-a-20

  70. Roya
    • 2 years ago
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    our formula for this one is x^2+(a+b)x+ab

  71. careless850
    • 2 years ago
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    ok..

  72. Roya
    • 2 years ago
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    so we should find 2 numbers which their mlt = -20 and their sum = -1 ok ?

  73. Roya
    • 2 years ago
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    mlt=multiple

  74. careless850
    • 2 years ago
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    ok.

  75. Roya
    • 2 years ago
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    so tell me the numbers which their mlt = -20

  76. careless850
    • 2 years ago
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    -10 * 2

  77. Roya
    • 2 years ago
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    can u tell me their sum ?

  78. careless850
    • 2 years ago
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    sum of...?

  79. careless850
    • 2 years ago
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    -10 + 2?

  80. Roya
    • 2 years ago
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    as u and me know their sum is 10-2 =8 ok ?

  81. Roya
    • 2 years ago
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    or as u wrote -10+2=-8

  82. careless850
    • 2 years ago
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    ok..

  83. Roya
    • 2 years ago
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    none of them are equal to -1 . am i right ?

  84. careless850
    • 2 years ago
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    Right.

  85. Roya
    • 2 years ago
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    so let's try another numbers . tell me two other number's which mlt=-20

  86. careless850
    • 2 years ago
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    -5*4

  87. Roya
    • 2 years ago
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    ok and tell me the sum

  88. careless850
    • 2 years ago
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    -5 + 4 = -1///

  89. careless850
    • 2 years ago
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    (x-5) (x+4) .... ^_^

  90. Roya
    • 2 years ago
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    so u find two numbers which mlt=-20 and sum = -1 so put them in our formula

  91. Roya
    • 2 years ago
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    such a genius boy . u should proud of urself .

  92. Roya
    • 2 years ago
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    know multiple two terms to check ur answer .

  93. careless850
    • 2 years ago
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    So, I got it right?

  94. Roya
    • 2 years ago
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    ok i give u another ex and plz solve it for me .

  95. Roya
    • 2 years ago
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    x^2+5x+6

  96. careless850
    • 2 years ago
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    ok...

  97. careless850
    • 2 years ago
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    mlt of 5 and sum of 6.. is....

  98. Roya
    • 2 years ago
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    oh oh ! mlt=6 sum=5

  99. careless850
    • 2 years ago
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    2.5 * 2 = 5 and 3* 2 = 6...

  100. careless850
    • 2 years ago
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    ohhhhhhhhhhhhhhhhhhhhhhhhhhhhhh...

  101. Roya
    • 2 years ago
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    note that u can't change the number for sum and mlt

  102. careless850
    • 2 years ago
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    3*2 = 6 and 3+2 = 5...

  103. Roya
    • 2 years ago
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    fantastic so put them in formula

  104. careless850
    • 2 years ago
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    (x+3) (x+2)

  105. Roya
    • 2 years ago
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    great job , look at this one : x^2+11x+18

  106. Roya
    • 2 years ago
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    first tell me the mlt and sum :

  107. careless850
    • 2 years ago
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    9-2 = 18 and 9+2 = 11. (x+9) (x+2)

  108. careless850
    • 2 years ago
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    9*2*

  109. careless850
    • 2 years ago
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    9*2 = 18 and 9+2 = 11.

  110. Roya
    • 2 years ago
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    9-2 no 9*2 dear yes u solve it .

  111. careless850
    • 2 years ago
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    I get THOSE.. why can't I get M questions...

  112. careless850
    • 2 years ago
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    Like this.. a^2 – 5a – 20..

  113. careless850
    • 2 years ago
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    sum of 5 and mlt of 20..

  114. careless850
    • 2 years ago
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    sum of -5 and -20*

  115. Roya
    • 2 years ago
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    it's a bit more difficult

  116. careless850
    • 2 years ago
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    Ugh. Sum of -5 and mlt of -20.**

  117. careless850
    • 2 years ago
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    How so? What do I have to do now?

  118. careless850
    • 2 years ago
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    HEY. I'm going to close this question and open another one. This one is getting laggy.

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