(3x+1)^2-2(3x+1)(3x+5)^2+(3x+5)^2
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Let's say that h(x) = x+3. To find the inverse switch h(x) and x and call h(x) by its inverse name 
. so f(x) = x - 3.
so h(f(x)) = (x - 3) + 3 = x what we did is plug f(x) in for x which is the inverse of h(x). The answer is h(f(x)) =x.
so h(f(x)) = (x - 3) + 3 = x what we did is plug f(x) in for x which is the inverse of h(x). The answer is h(f(x)) =x.