Question

Find and simplify the expression if f(x)=x^{2}-2 . f(3 x) f(3 x)= (Simplify your answer.)

Answer 1

f(3x) = 9x² - 2

Explanation:

to evaluate f(3x) substitute x = 3x into f(x) , that is

f(3x) = (3x)² - 2 = 9x² - 2