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2) f(x) = x² + 2
g(x) = 2x - 3
fog(x) = f {g(x)} = f (2x -3) = (2x-3)² + 2
fog(x) = 4x² - 12x + 9 + 2
atau
f o g (x) = 4x² - 12 x + 11