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x - 1
f ' (x) = 2x(x-1) - (x² + 3)
(x-1)²
= 2x² - 2x - x² -3
(x-1)²
= -2x - 3
(x-1)²
turun jika f '(x) = 0
-2x - 3 = 0
(x-1)²
-2x - 3 = 0
2x = -3
x = -3/2