xp = -b/2a
xp = -8/2(2)
xp = -8/4
xp = -2
yp = -D/4a
yp = -(b²-4ac)/4a
yp = -(8²-4(2)(11))/4(2)
yp = -(64-88)/8
yp = 24/8
yp = 3
yp = f(xp)
yp = f(-2)
yp = 2x² + 8x + 11
yp = 2(-2)² + 8(-2) + 11
yp = 2(4) - 16 + 11
yp = 8 - 5
yp = 3
Sehingga koordinat titik baliknya adalah (-2, 3).
(Sumber: Kompas.com/[Risya Fauziyyah] I Editor: [Rigel Raimarda])
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