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f'(x) = 0
3x² + 8x - 16 = 0
(x+4)(3x-4) = 0
x = -4 dan x = 3/4
Untuk itu, substitusikan:
f(-4) = -64 + 64 + 64 + 4
f(-4) = 68
f(3/4) = 27/64 + 9/4 - 12 + 4
f(3/4) = - 341/64
Maka, titik puncak:
Lokal maksimum : (3/4, -341/64)
Lokal minimum: (-4,68)