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-1 = a (0+2) (0+2)
-1 = 4a
a = -1/4
y = -1/4 (x+2) (x+2)
= -1/4 (x²+4x+4)
y = -1/4 x²- x - 1
3) y = a(x-x₁)(x-x₂)
y = a (x-2)(x-5)
4 = a (3-2)(3-5)
= a. 1. (-2)
a = -2
y = -2 (x-2)(x-5)
= -2 (x²-7x+10)
= -2x²+14x-20