Formula help

Let f(x) = 1/(x+7)+15/(x-8). Find all a for which f(a)=f(a+15).

How do I solve this problem?

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asked by David
  1. ok, solve.

    f(a)=f(a+15)
    1/(7+a) + 15/(a-8) = 1/(a+22) + 15/(a+7)

    multiply both sides of the equation by

    (a+7)(a-8)(a+22)
    and solve.

  2. This is a multiple choice question and I am not getting any of the choices

    a.) -161/8
    b.) 120/7
    c.) 161/7
    d.) -17

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    posted by David
  3. Nor do I.

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