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anonymous

  • 5 years ago

2x1/-6x1/-5 please help!!

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  1. anonymous
    • 5 years ago
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    the / is a division sign

  2. anonymous
    • 5 years ago
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    Can u pls type it using the equation tab below. It is difficult to understand it like this

  3. anonymous
    • 5 years ago
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    well h/o.. write ur answer as a fraction in simplest form. does this help? 2 X 1 X 1 --- --- -6 -5

  4. anonymous
    • 5 years ago
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  5. anonymous
    • 5 years ago
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    The answer is 1/15

  6. anonymous
    • 5 years ago
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    great! now how ab

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  7. anonymous
    • 5 years ago
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    When you have such multiplication of fractions, follow the rule : (Here N means numerator and D means denomination) N1 x N2 x N3 N1 x N2 x N3 -- -- -- = ------------- D1 D2 D3 D1 X D2 X D3

  8. anonymous
    • 5 years ago
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    ohh ok

  9. anonymous
    • 5 years ago
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    Now using this formula try to solve yourself and I'll check if it is correct

  10. anonymous
    • 5 years ago
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    do u multiply the -7 with the N or D?

  11. anonymous
    • 5 years ago
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    in the 2nd problem?

  12. anonymous
    • 5 years ago
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    You can treat it as -7 -- 1 So you multiply -7 with the numerator group

  13. anonymous
    • 5 years ago
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    oh okay

  14. anonymous
    • 5 years ago
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    soo 98 -- -54

  15. anonymous
    • 5 years ago
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    Correct!! But something more needs to be done

  16. anonymous
    • 5 years ago
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    simplify? idk how to do that with this fraction

  17. anonymous
    • 5 years ago
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    First, we hv to reduce it to lowest terms Second, make the denominator positive

  18. anonymous
    • 5 years ago
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    OK, Both are even nos and hence divisible by 2 So go ahead and divide both by 2

  19. anonymous
    • 5 years ago
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    Then multiply this by -1/-1 to make the denominator positive

  20. anonymous
    • 5 years ago
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    Done????

  21. anonymous
    • 5 years ago
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    49 -1 --- x ___ -27 -1

  22. anonymous
    • 5 years ago
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    soo that means the answer is this? -49 --- 27

  23. anonymous
    • 5 years ago
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    BINGO !!!! You got the hang of it !!

  24. anonymous
    • 5 years ago
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    yay! is that simplest form?

  25. anonymous
    • 5 years ago
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    Now I'll teach you how to reduce it to lower terms easily

  26. anonymous
    • 5 years ago
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    okay :)

  27. anonymous
    • 5 years ago
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    Yes it is because 49 is 7 x 7 and 27 is 3 x 3 x 3 So both numbers do not hv any common factor left

  28. anonymous
    • 5 years ago
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    okay thank u

  29. anonymous
    • 5 years ago
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    your question was 2 x -7 x -7 --- --- 9 -6

  30. anonymous
    • 5 years ago
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    We modify it to 2 x -7 x -7 --- --- --- 9 1 - 6

  31. anonymous
    • 5 years ago
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    Now we can easily see that 2 in the numerator of first fraction and 6 in the denominator of third fraction are both divisible by 2 and so we divide them by 2 to get 1 x -7 x -7 --- --- --- 9 1 -3

  32. anonymous
    • 5 years ago
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    Following me???

  33. anonymous
    • 5 years ago
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    ok now i have another ? is -3(3x-u)+(2u-4x) simplified to -9?

  34. anonymous
    • 5 years ago
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    yes

  35. anonymous
    • 5 years ago
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    Now you can clearly see that numerators on top and denominators at bottom cannot be cross -cut as they do not have common factors so now multiply all numerators and all denominators and basically shift the - sign to the numerator

  36. anonymous
    • 5 years ago
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    is that the simplified expression to that expression? yes.thank u for explaining that to me.

  37. anonymous
    • 5 years ago
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    Yes, when u hv many fractions, you can use cross-cutting to cancel out common factors Now to yr second question..... -3(3x-u)+(2u-4x) = -9x + 3u + 2u - 4x = -9x - 4x + 3u + 2u = - 13x + 5u

  38. anonymous
    • 5 years ago
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    How did u arrive at -9 ??

  39. anonymous
    • 5 years ago
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    -3(-3x-u)+(2u-4x) -3(-3x)+1+(-4x) -3+1+-7

  40. anonymous
    • 5 years ago
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    i did it wrong

  41. anonymous
    • 5 years ago
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    but i was supposed to distribute

  42. anonymous
    • 5 years ago
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    Yes, when you have an expression like -3(3x-u), you have to first use the DISTRIBUTIVE LAW to open the bracket and then solve further

  43. anonymous
    • 5 years ago
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    wait..it said that wasn't correct.

  44. anonymous
    • 5 years ago
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    What's the ans u hv????

  45. anonymous
    • 5 years ago
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    i got 5x-1u

  46. anonymous
    • 5 years ago
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    1u ? :|

  47. anonymous
    • 5 years ago
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    -3(-3x-u) + (2u-4x) (9x-3u) + (2u-4x) -1u + 5x 5x + -1u 5x-1u

  48. anonymous
    • 5 years ago
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    Then u gave me the wrong question the first time around!!!! Go and check....

  49. anonymous
    • 5 years ago
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    i did! i'm sorry!! ahaha i put 3 and it was supposed to be -3 i think

  50. anonymous
    • 5 years ago
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    but am i correct (with the problem i just did)

  51. anonymous
    • 5 years ago
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    Well, one can always make mistakes while typing...... No, your answer is not correct. See my working below... -3(-3x-u) + (2u-4x) = 9x + 3u + 2u - 4x = 9x - 4x + 3u + 2u = 5x + 5u = 5 (x + u)

  52. anonymous
    • 5 years ago
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    "5x-1u " :\ why is there a 1 in front of the u ?

  53. anonymous
    • 5 years ago
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    you write "5-u" , no need for the 1 , it just makes it look messy , whenever I mark maths if I see anyone write coeffiecent of 1 then they lose marks

  54. anonymous
    • 5 years ago
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    But her answer is wrong anyway.....

  55. anonymous
    • 5 years ago
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    yeh , doesnt mean you cant correct notation

  56. anonymous
    • 5 years ago
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    agreed :)

  57. anonymous
    • 5 years ago
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    But if you deduct marks for this, I feel u r too harsh on the students. Just putting a circle and remarking shud do th job

  58. anonymous
    • 5 years ago
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    yeah but for my learning purposes i sometimes put the -1 so i don't lose track.

  59. anonymous
    • 5 years ago
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    but anyway..i see what u did harkirat ... idk what the crap i did! haha

  60. anonymous
    • 5 years ago
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    No sweat, we all learn by making mistakes and correcting them

  61. anonymous
    • 5 years ago
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    yeh, probably for like year4 kids in primary you wouldnt mark down , but if they are in high school and writting coefficents of 1 then there is something wrong , it makes you looks stupid putting 1u , because that shows the marker that you dont know that 1 times u =u

  62. anonymous
    • 5 years ago
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    @elecengineer R u located in the US??

  63. anonymous
    • 5 years ago
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    australia

  64. anonymous
    • 5 years ago
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    R u an Indian by any chance??

  65. anonymous
    • 5 years ago
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    no, not asian either

  66. anonymous
    • 5 years ago
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    but alot of the electrical engineering lecturers at my uni are

  67. anonymous
    • 5 years ago
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    im white lol

  68. anonymous
    • 5 years ago
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    Just asking, hope u didn't mind

  69. anonymous
    • 5 years ago
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    you shouldn't call students stupid...they mean the same thing. -1u and -u...just because it's marked differently doesnt mean you should mark down a grade..the answer is not wrong technically. its like your punishing your students because their teacher is a neat freak.

  70. anonymous
    • 5 years ago
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    I'm an Indian and I know teachers here (in India) r very harsh with such things and penalise even small things

  71. anonymous
    • 5 years ago
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    C'mon lauren, thats not nice

  72. anonymous
    • 5 years ago
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    i dnt care what they say ^

  73. anonymous
    • 5 years ago
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    but hey i'm just a first year college student. what do i know? but anywho the answer 5x+5u was correct!!! yayy!! i'm sorry. i'm just the type of person who says what i feel. i'm sorry if i offended you. just different opinions that is all.

  74. anonymous
    • 5 years ago
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    but seriously, if you are in high school you shouldnt need to write the 1s

  75. anonymous
    • 5 years ago
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    you are first year of uni , 19yrs old and you still write the 1s , you should have dropped that a long time ago lol

  76. anonymous
    • 5 years ago
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    C'mon friends, let us change the topic

  77. anonymous
    • 5 years ago
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    Do u need to ask anything else lauren??

  78. anonymous
    • 5 years ago
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    agreed. i don't like negativity. and yes...one sec please.

  79. anonymous
    • 5 years ago
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  80. anonymous
    • 5 years ago
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    im not negative , just stating the facts, and I would be very surprised if a uni tutor doesnt mark down because of bad notation , its one thing to get the right answer, but you also need to express yourself confidently

  81. anonymous
    • 5 years ago
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    if you click the link it makes it bigger.

  82. anonymous
    • 5 years ago
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    ^ thats first year uni math? cant be

  83. anonymous
    • 5 years ago
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    what do you mean by "college"

  84. anonymous
    • 5 years ago
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    i'm in Math098...i'm not the best math student and have never really been good at math or liked it...but it is a lower level of math.

  85. anonymous
    • 5 years ago
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    but i do go to a university.

  86. anonymous
    • 5 years ago
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    k... thats like the stuff we do in year8 in high school in australia

  87. anonymous
    • 5 years ago
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    lauren, u do it and tell me the ans I'll confirm if it is ok This is a simple one, just b careful while using the Dist. LAW

  88. anonymous
    • 5 years ago
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    i got -11y+8

  89. anonymous
    • 5 years ago
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    wow :p

  90. anonymous
    • 5 years ago
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    Bingo !! Its correct , the working as follows -4 (3y - 2) + y = -12y + 8 + y = - 11y + 8

  91. anonymous
    • 5 years ago
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    =)

  92. anonymous
    • 5 years ago
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    I should go fetch a really hard version of these from one of my high maths text books , these are far too easy :p

  93. anonymous
    • 5 years ago
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    something much more complex

  94. anonymous
    • 5 years ago
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    k u go do that. lol

  95. anonymous
    • 5 years ago
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    Ok lauren, give this a try 2(x+ 3y) -7(2y - 5z) + 3(2x - 3y +z)

  96. anonymous
    • 5 years ago
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    Focus and you'll do it right

  97. anonymous
    • 5 years ago
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    k h/o

  98. anonymous
    • 5 years ago
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    nah , just expanding is no fun, I am talking really messy algebraic fractions , with fractions inside fraction etc , really fun :p

  99. anonymous
    • 5 years ago
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    C'mon elecengineer, giv her a break U r suggesting a mosquito weight fights Mike Tyson :D

  100. anonymous
    • 5 years ago
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    8x-23y+38z

  101. anonymous
    • 5 years ago
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    not quite

  102. anonymous
    • 5 years ago
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    lauren, redo it and keep + and - signs in mind while expanding

  103. anonymous
    • 5 years ago
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    it wasnt the signs that caused the mistake :|

  104. anonymous
    • 5 years ago
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    8x-17y+38z and i missed one of the y terms while comining like terms.

  105. anonymous
    • 5 years ago
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    combining*

  106. anonymous
    • 5 years ago
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    Good, u did it!!

  107. anonymous
    • 5 years ago
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    cool :)

  108. anonymous
    • 5 years ago
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    Maths needs constant/regular/focussed practice

  109. anonymous
    • 5 years ago
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    Find more such sums and keep doing them

  110. anonymous
    • 5 years ago
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    thanks harkirat....are these like terms? 8x and 8x^2

  111. anonymous
    • 5 years ago
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    no

  112. anonymous
    • 5 years ago
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    do u know why??

  113. anonymous
    • 5 years ago
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    bc of the exponent

  114. anonymous
    • 5 years ago
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    Correct, In Algebra, for like terms we look at the variables and not the coefficient

  115. anonymous
    • 5 years ago
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    For eg if u hv these four terms -5 x^2y^5z , 7x^2y^5 , 2zy^5x^2 , -11 xyz

  116. anonymous
    • 5 years ago
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    k got it

  117. anonymous
    • 5 years ago
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    The two like terms here are -5 x^2y^5z , 2zy^5x^2 becoz both hv x^2 y^5 and z as algebraic factors

  118. anonymous
    • 5 years ago
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    Got it??

  119. anonymous
    • 5 years ago
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    yep!

  120. anonymous
    • 5 years ago
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    So just look at varible and their powers If two terms have all variables same and their powers same, then they r like, irrespective of their coefficients

  121. anonymous
    • 5 years ago
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    here the operative word is ALL ALL variables same and their respective powers same

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