subtract:1-x+2x2-x3 from 2x3-x2+3x+2
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Solution:
Let A = 1-x+2x²-x³,
B = 2x³-x²+3x+2
According to the problem given,
B-A = 2x³-x²+3x+2-(1-x+2x²-x³)
= 2x³-x²+3x+2-1+x-2x²+x³
= 2x³+x³-2x²+3x+x+2-1
= (2+1)x³-2x²+(3+1)x+1
= 3x³-2x²+4x+1
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