diketahui f(x) = x kuadrat - 4x +6 dan g(x) = 2x + 3 .fungsi komposisi f bundaran g (x)

f(x) = x² - 4x + 6
g(x) = 2x + 3

(f o g) (x) = f (g(x))

= (2x + 3)² - 4(2x + 3) + 6

= 4x² + 12x + 9 - 8x - 12 + 6

= 4x² + 4x + 3

(f°g)(x)=x² - 4x + 6
          = (2x + 3)² - 4 (2x + 3) + 6
          = 4x² + 12x + 9 - 8x + 12 + 6
          = 4x²+ 12x - 8x + 9 + 12 + 6
          = 4x² + 4x + 27