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Math Help - question5

  1. #1
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    question5

    a and b are negative integers,

    if a>b

    a.b=5(a-b)

    b=?

    a)-20 b)-12 c)-8 d)4 e)21
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  2. #2
    MHF Contributor Quick's Avatar
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    Quote Originally Posted by OPETH View Post
    a and b are negative integers,

    if a>b

    a.b=5(a-b)

    b=?

    a)-20 b)-12 c)-8 d)4 e)21
    please don't ask us every problem you have for homework, try doing them yourself and if you're really really stuck on one, then post it.
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  3. #3
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    Quote Originally Posted by Quick View Post
    please don't ask us every problem you have for homework, try doing them yourself and if you're really really stuck on one, then post it.

    Homework? Those questions are not my homework.

    I wanted to solve those.

    I found " 4 " the result.
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  4. #4
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    Quote Originally Posted by OPETH View Post
    a and b are negative integers,

    if a>b

    a.b=5(a-b)

    b=?...
    Quote Originally Posted by OPETH View Post
    ...

    I found " 4 " the result.
    Ähemm!

    Since b = \frac{5a}{a+5} = 5-\frac{25}{a+5}
    and both numbers should be negative I've got a = -4 and b = -20. Obviously the condition a > b is satisfied.
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