titik puncak dari persamaan 2xpangkat2+6x-8

pers kuadrat: y = ax^2 + bx + c
y = 2x^2 + 6x + 8

Xp = -b / 2a = -6/(2.2) = -6/4 = -3/2
Yp = 2(-3/2)^2 + 6(3/2) + 8
Yp = 9/2 + 9 + 8 = 21 1/2