f(x)=x^2. What is g(x)?

Answer 1

You need some additional information. Part of the problem seems missing

For example, if g(x) = [f(x)]^2, then g(x) = x^4

or if g(x) = f(x)+2x^2 then g(x) = 3x^2

or if g(x)= sqr(f(x)) then g(x) = sqrx^2 = x

or if g(x) = f(x) -10 then g(x) = x^2 -10

or if g(x) = xf(x), then g(x) = x^3