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Math Help - Please, just a little help?

  1. #1
    Newbie
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    Jan 2010
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    Please, just a little help?

    Hello!

    I just need a little help with the next few problems. I keep getting these type wrong and it's a little frustrating. Any help is appreciated. Thanks, so so much.

    A. given: f(x)= (x+5)/x and g(x)= x^2-3, find (g o f)(-9)

    B. simplify the following:

    7 + __b____
    .......7 + __7__
    .................7 + b

    The ..... are just for spacing. I know thats a rough picture but I think you get the point? Thanks.
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  2. #2
    No one in Particular VonNemo19's Avatar
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    Detroit, MI
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    Quote Originally Posted by cantinalou View Post
    Hello!

    I just need a little help with the next few problems. I keep getting these type wrong and it's a little frustrating. Any help is appreciated. Thanks, so so much.

    A. given: f(x)= (x+5)/x and g(x)= x^2-3, find (g o f)(-9)

    B. simplify the following:

    7 + __b____
    .......7 + __7__
    .................7 + b

    The ..... are just for spacing. I know thats a rough picture but I think you get the point? Thanks.
    A) (g\circ{f})(x)=g[f(x)]=[f(x)]^2-3=\left(\frac{x+5}{x}\right)^2-3

    So, now just evaluate at -9.
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