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Question

Subtract the second polynomial from the first:
(i)x4+x2+x1; x4x3x2+1
(ii)5x22y+9; 3x2+5y7

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Solution

(i) (x4+x2+x1)(x4x3x2+1)=x4+x2+x1x4+x3+x21
=x4x4+x3+x2+x2+x11=x3+2x2+x2
(ii) 5x22y+9(3x2+5y7)=5x22y+93x25y+7
=5x23x22y5y+9+7=2x27y+16

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