y=3x2+4x-2 persamaan titik puncak

turunan = 0
6x + 4 = 0
6x = -4
x = -4/6 = -2/3
y = 3(-2/3)² + 4(-2/3) - 2
y = 4/3 - 8/3 - 6/3
y = -10/3
titik puncak (-2/3 , -10/3)