Tentukan titik ekstrem parabola y=fx)=x2 -7x+12

turunan = 0
2x - 7 = 0
2x = 7
x = 7/2
y = (7/2)² - 7(7/2) + 12
y = (49/4) - (49/2) + 12
y = (49/4) - (98/4) + (48/4)
y = -¼
titik ekstrim (7/2 , -¼)