jika fungsi f(x) = x² - 2 dan g(x) = 2x + 1 . Tentukan komposisi f(g(x))

f (x) = x² - 2
g (x) = 2x + 1

f (g (x))
= f (2x + 1)
= (2x + 1)² - 2
= (4x² + 2x + 2x + 1) - 2
= 4x² + 4x + 1 - 2
= 4x² + 4x - 1

f(x) = x^2-2, g(x) = 2x+1
fog (x) = (2x+1)^2 - 2
= 4x^2 +4x-1