Question

Sejam f(x)=2x ao quadrado -1 e g(x)=x+2. Calcule (f o g)(x)

Answer 1

(fog)(x)= 2.(x+2)² - 1
(fog)(x) = 2(x² + 2x + 1) - 1
(fog)(x) = 2x² + 4x + 2 -1

(fog)(x) = 2x² + 4x + 1



att: Jhonny

Answer 2

2
f{g(×)} = 2(×+2) - 1

2 2
(×+2) = (×+2).(×+2) x + 4× + 4

2
f{g(×)} = 2(×+4×+4) - 1

2
f{g(×)} = 2× + 8× + 8 - 1

2
f{g(×)} = 2× + 8x + 7.