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Grafik memotong di sumbu x di A (-1,0) dan B (3,0) melalui (0,6)
*Cari nilai a
y= a(x-x1)(x-x2)
6= a(0+1)(0-3)
6= a X 1-3 = -3a
a= 6/-3= -2
a= -2
Subsitusi a= -2 ke rumus
y= -2(x+1)(x-3)
y= -2(x^2 -3x +1x -3)
y = 2x^2 -4x +6
Jadi jawabannya adalah yang E. 2x^2 -4x +6