Question

f(x)=x-2 e g(x)=x²+x
a) f(f(x))
b)g(f(x))

Answer 1

a) f(f(x)) = f(x-2) = x - 2 - 2 = x - 4

b) g(f(x)) = g(x-2) = (x - 2)² + x = x² - 4x + 4 - 4 = x² - 4x