p(x)=p1(x)+p2(x)-4*p3(x)
p1(x)= -2x² + 3x
p2(x)= 4x²-3
p3(x) =2x-4.
p(x)=-2x²+3x+4x²-3-4(2x-4)=2x²+3x-3-8x+16=2x²-5x+13
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