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Math Help - composite and invers function problem

  1. #1
    Junior Member
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    Nov 2009
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    composite and invers function problem

    need help with inverse function problem.

    1.find the inverse for:
    f(x)=x^4+2 x^3+ 3 x^2 + 2 x^2+1?

    and

    this one is composite function problem
    2.if f(x y)=f(x+y) and given that f(7)=7, find the value of f(49)?

    thanks for the reply...
    Last edited by pencil09; February 18th 2010 at 04:59 PM.
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  2. #2
    Junior Member
    Joined
    Nov 2009
    Posts
    63
    1.
    i've try to simplify the function:
    so,
    f(x)= (x^\frac{1}{2})^8 +2(x^\frac{1}{2})^6 + 3(x^\frac{1}{2})^4 + 2(x^\frac{1}{2})^2 +1
    and ????
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