f(x)=a(x-2)(x+1)(x-3)f(1)=a(-1).2.(-2)8=a.4a=2f(x)=2(x-2)(x+1)(x-3)=(2x-4)(x²-2x-3)f(x)=2x³-4x²-6x-4x²+8x+12f(x)=2x³-8x²+2x+12
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f(x)=a(x-2)(x+1)(x-3)
f(1)=a(-1).2.(-2)
8=a.4
a=2
f(x)=2(x-2)(x+1)(x-3)=(2x-4)(x²-2x-3)
f(x)=2x³-4x²-6x-4x²+8x+12
f(x)=2x³-8x²+2x+12