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Math Help - simple question but i need help

  1. #16
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by chancey View Post
    You've done something wrong. Not sure what it is, but this is how I did it

    (x-1)/(x+4) = (x+3)/(x-7)

    (x-1)/(x+4) - (x+3)/(x-7) = 0

    ((x-1)(x-7) - (x+4)(x+3)) / ((x+4)(x-7)) = 0

    (x-1)/(x-7) - (x+4)/(x+3) = 0

    x^2 - 8x + 7 - (x^2 + 7x + 12) = 0

    -15x - 5 = 0

    -15x = 5

    x = -5/15 = -1/3
    Line 5 is written incorrectly, but as line 6 is correct I suspect it's just a typo. Both your and Soroban's derivations are correct, you simply used a slightly different method.

    -Dan
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  2. #17
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    Quote Originally Posted by topsquark View Post
    Line 5 is written incorrectly, but as line 6 is correct I suspect it's just a typo. Both your and Soroban's derivations are correct, you simply used a slightly different method.

    -Dan
    Oops, typo. Theres not supposed to be '/' in there
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  3. #18
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    thank you everyone
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