Question

Let f(x) = 7x and g(x) = 3x + 10. Find f(g(x)).
why is the answer not f(g(x))=21x^2+70x

Answer 1

f(g(x)) is not the same as f(x)*g(x)

f(g(x)) means replace x with g(x) in f(x), so f(g(x)) = 7(3x+10)

Answer 2

Thank you so much i understand now