Question

Find f(g(x))f(x) = 3x^2 + 2g(x) = sqrt7x^3

Answer 1

f(x) = 3x² + 2

g(x) = √(7x³)

Basically you need to evaluate f(x) for x = g(x), in another words, replace every x in f(x) for g(x):

f(g(x)) = 3 (√(7x³) )² + 2 = 3(7x³) + 2 = 21x³ + 2