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y=a(x-x1)(x-x2)
y=a(x-3)(x+2)
A=(-1,2)
2=a(-1-3)(-1+2)
2=a*(-4)
a=-2/4
a=-1/2
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y=-1/2( x-3)(x+2)
y=-1/2( x²+2x-3x-6)
y=-1/2x²+1/2x+3