Titik balik minimum pada grafik fungsi y=x²-2x-8

x = -b/2a = 2/2 = 1

y = b²-4ac/-4a
=(-2)²-4(1)(-8)/-4(1)
=4+32/-4
=36/-4
=-9

Titik balik minimum = (1,-9)

Maaf ya klau salah