(f o g)(x) means take the expression for f(x) and replace x by g(x).
a. f(x) = 5x^3, so f(g(x)) = 5g(x)^3 = 5*[(x+1)^3] ^3
b. f(x) = (x + 1)^3, so f(g(x)) = (g(x) + 1)^3 = (5x^3 + 1)^3
c. f(x) = x + 1, so f(g(x)) = g(x) + 1 = 5x^3 + 1
d. f(x) = 5x^3, so f(g(x)) = 5g(x)^3 = 5 (x + 1)^3
So what choice is equal to h(x) ?
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