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(f o g)(x) artinya f(g(x))
maka
f(g(x)) = f(4x - 1)
= 2(4x - 1)² - 3(4x - 1) + 4
= 2(16x² - 4x + 1) - 12x + 3 + 4
= 32x² - 8x + 2 - 12x + 7
= 32x² - 20x + 9
b)
(f o g)(2) artinya input x=2 ke pers yg sdh qt dpt di (a)
(f o g)(2) = 32(2)² - 20(2) + 9 = 32(4) - 40 + 9 = 120 - 40 + 9 = 89