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(x2,y2) = (-4,0)
y = a(x - x1)(x - x2)
y = a(x-2)(x+4) melalui (0, -8)
-8 = a(0-2)(0+4)
-8 = -8a
a = 1
y = (x -2)(x+4)
y = (x² + 2x - 8)