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maaf yah kalau salah,aku juga masih belajar.
g(x) = x - 9
(fog)(x) = f(g(x))
= (g(x))² + 6(g(x) + 5
= (x-9)² + 6(x-9) + 5
= x² - 18x + 81 + 6x - 54 + 5
= x² - 12x + 32
(fog)(x) = 0
0 = x² - 12x + 32
0 = (x - 4)(x - 8)
x = 4 atau x = 8