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b)(x+1)x²+(x+1)(1-x)+(x+1)²=(x+1)(x²+(1-x)+(x+1))=
(x+1)(x²+1-x+x+1)=(x+1)(x²+2)
a)(a+b)x(x2+x+1)
(a+b)x(x²+x+1)
b)
(x+1)x²+(x+1)(1-x)+(x+1)²=(x+1)x²-x²+1+x²+1=(x+1)x²+2=(x+1)(x²+2)