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(3-p^3)(p^2+1)=3p^2+3-p^5-p^3=-p^5-p^3+3p^2+3
b)
(x^7-x^5)(x^3+x^2)=x^10+x^9-x^8-x^7
c)
(x+√5)(x-√5)=x^2-x√5+x√5-√25=x^2-5