Koordinat titii balik grafik fungsi y=x2-2x-15=

A=1 b=-2 c=-15

Xp = -b/2a
Xp= 2/2.1
Xp= 1

Yp= 1^2 – 2.1 – 15
Yp= -16

jadi, koordinat titik baliknya (Xp,Yp) = (1,-16)