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while adding polynomial we collect the like terms and add them .
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a. (8x²+2x)+(-12x²)+(9x-3x²)
=8x²+2x-12x²+9x-3x²
=7x²+11x
b. (9x³-2x^4 -12+7x)+(-x³+12x+22-8x^4)
=9x³-2x^4-12+7x-x³+12x+22-8x^4
=8x³-10x^4+19x+10
c. (3xy+2x-3y)+(9x+11y-17xy)+(4x+4y-4xy)
= 3xy+2x-3y+9x+11y-17xy+4x+4y-4xy
=15x+12y-18xy
d.(l²+m²)+(m²+n)+(n²+l²)+(2mn+2nl+2lm)
=l²+m²+m²+n²+n²+l²+2mn+2nl+2lm
=2l²+2m²+2n²+2mn+2nl+2lm
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