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Titik stasioner jika f'(x) = 0
3x^2 - 6x - 24 = 0
x^2 - 2x - 8 = 0
(x - 4)(x + 2) = 0
x = 4 atau x = -2
x = 4 => f(4) = 4^3 - 3(4)^2 - 24(4) + 8 = 64 - 48 - 96 + 8 = -72
x = -2 => f(-2) = (-2)^3 - 3(-2)^2 - 24(-2) + 8 = -8 - 12 + 48 + 8 = 36
Jadi titik stasioner ya (4,-72) dan (-2,36)