tentukan koordinat titik puncak fungsi y=2ײ+8×+11

jswab

y = 2x^2 + 8x + 11
y' = 0
4x + 8 = 0
4x  = -8
x = - 2
y = 2(-2)^2 +8(-2) + 11
y =  8 -16 + 11
y = 3

titik puncak (x.y)= (-2, 3)