f(x)=-2x²-3 dan g(x)=4+3x tentukan (fog)(x)

F(x) = 2x²-3x+4
g(x) = x+2
(f°g)(x) = ?

Jawab:
(f°g)(x) = 2(x+2)²-3(x+2)+4
(f°g)(x) = 2 (x²+4x+4)-3x-6+4
(f°g)(x) = 2x²+8x+8-3x-2
(f°g)(x) = 2x²+5x+6
Maaf kalau salah

(f o g)(x) = f(g(x))
= f(4 + 3x)
= -2(4 + 3x)² -3
= -2(9x² + 24x + 16) -3
= -18x² - 48x - 32 -3
= -18x² - 48x - 35
atau = 18 ² + 48x + 35