1) x^3+8y^3-x-2y=x(x^2-1)+2y(4y^2-1)=x(x-1)(x+1)+2y(2y-1)(2y+1)
2)(p^3-8)(p-1)=(p-2)(p^2+2p+4)
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Answers & Comments
1) x^3+8y^3-x-2y=x(x^2-1)+2y(4y^2-1)=x(x-1)(x+1)+2y(2y-1)(2y+1)
2)(p^3-8)(p-1)=(p-2)(p^2+2p+4)