Parabola y=-x2-2x-8 dicerminkan terhadap garis x=2

Y =- x² – 2x – 8
dicerminkan terhdp grs x = 2
x' = 2(2) – x –> x' = 4- x –> x= 4 – x'
y'= y

y' = -x² – 2x – 8 —> y' = – (4-x')² – 2(4-x')- 8
y' = -(x'² – 8x' +16) + 2x' -8 – 8
y' = -x'² + 8x' – 16 + 2x' -16
y' = -x'² +10x' – 32
bayangan nya y = -x² +10x – 32