jika f (x) = x2 - 5x + 1, g (x) = x + 1, maka nilai dari (fog)(x) adalah ..

(fog)(x) = (x+1)^2 - 5(x+1) + 1
= x^2 + 2x + 1 - 5x -5 + 1
= x^2 - 3x -3

f(x) = x^2- 5× +1
g(x) = x+1

(fog) artinya fungsi g dikomposisikan ke fungsi f jadi..

(fog) (x) = (×+1) ^2- 5(×+1) +1
= (x + 1) (x+1) -5× - 5 +1
= ×^2 + 2× +1 - 5× -4
= x^2 -3× -3