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g(x + 1) = 2x - 3
(fog)(x) = .........?
* Mencari g(x)
g(x) = 2(x - 1) - 3
= 2x - 2 - 3
= 2x - 5
* Mencari (fog)(x)
(fog)(x) = f(g(x)
= (2x - 5)² - 2(2x - 5) + 4
= (4x² - 20x + 25) - 4x + 10 + 4
= 4x² - 24x + 25 + 10 + 4
= 4x² - 24x + 39
Jadi, (fog)(x) = 4x² - 24x + 39