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Math Help - Question regarding functions

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    Question regarding functions

    I am having some difficulty solving this question, any help would be greatly appreciated.

    Thx in advance!
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  2. #2
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by Solid8Snake View Post
    I am having some difficulty solving this question, any help would be greatly appreciated.

    Thx in advance!
    If f(t)=\frac{t-x}{t+y}, then

    f(x+y)=\frac{x+y-x}{x+y+y}=\frac{y}{x+2y}

    f(x-y)=\frac{x-y-x}{x-y+y}=-\frac{y}{x}

    Thus, f(x+y)+f(x-y)=\frac{y}{x+2y}-\frac{y}{x}=\dots

    Can you take it from here?
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