f(x – 2) = … ?
Jawab
(g o f)(x) = 4x² + 4x
g(f(x)) = 4x² + 4x
[f(x)]² – 1 = 4x² + 4x
[f(x)]² = 4x² + 4x + 1
[f(x)]² = (2x + 1)(2x + 1)
[f(x)]² = (2x + 1)²
f(x) = 2x + 1
f(x – 2) = … ?
Jawab
(g o f)(x) = 4x² + 4x
g(f(x)) = 4x² + 4x
[f(x)]² – 1 = 4x² + 4x
[f(x)]² = 4x² + 4x + 1
[f(x)]² = (2x + 1)(2x + 1)
[f(x)]² = (2x + 1)²
f(x) = 2x + 1
Editor: Muhammad Khusaini