subtract the following by using column method. 7x³+9x²+3x-7 from 18x³-9x+8
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=18x3-9x+8- ( 7x3+9x2+3x-7)
=18x3-9x+8-7x3-9x2-3x+7
=18x3-7x3-9x2-9x-3x+8+7
=11x3-9x2-12x+15
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