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Verified answer
Verified answer
Diketahui :f (x) = x³ - 3x² - 24x - 7
Ditanya : nilai stasioner fungi f (x) ?
Dijawab :
Nilai stasioner dicapai saat f'(x) = 0
f (x) = x³ - 3x² - 24x - 7
f'(x) = 3x³⁻¹ - 6x²⁻¹ - 24
f'(x) = 3x² - 6x - 24
f'(x) = x² - 2x - 8
Syarat f'(x) = 0
f'(x) = 0
x² - 2x - 8 = 0
(x - 4) (x + 2) = 0
x = 4, x = -2
Untuk x = 4
f (4) = 4³ - 3 (4)² - 24 (4) - 7
f (4) = 64 - 3 (16) - 96 - 7
f (4) = 64 - 48 - 96 - 7
f (4) = -87
Untuk x = -2
f (-2) = (-2)³ - 3 (-2)² - 24 (-2) - 7
f (-2) = -8 - 3 (4) + 48 - 7
f (-2) = -8 - 12 + 48 - 7
f (-2) = 21
Jadi, nilai stasioner dari fungsi f (x) adalah -87 dan 21