(fog) (x)=2x²+2x 9(x)=x-1 Tentukan f(x)?

jawab
fungsi
g(x) =  x- 1
fog(x)  = 2x² + 2x
f{ g(x) } = 2x² + 2x
f(x -1) = 2x² + 2x
f(x -1 +1) = 2(x +1)² + 2(x + 1)
f(x) = 2(x² +2x +1) + 2x + 1
f(x) = 2x² + 4x + 2 + 2x + 1
f(x) = 2x² + 6x + 3