(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)²
f(x) = 2x + 1
f(x - 2)
= 2(x - 2) + 1
= 2x - 4 + 1
= 2x - 3
Jawaban C
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(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)²
f(x) = 2x + 1
f(x - 2)
= 2(x - 2) + 1
= 2x - 4 + 1
= 2x - 3
Jawaban C