# composite and invers function problem

• February 18th 2010, 04:16 PM
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composite and invers function problem
need help with inverse function problem.

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

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)?:confused:

$f(x)= (x^\frac{1}{2})^8 +2(x^\frac{1}{2})^6 + 3(x^\frac{1}{2})^4 + 2(x^\frac{1}{2})^2 +1$