Identity a3+b3=(a+b)(a2−ab+b2)a^3+b^3=(a+b)(a^2-ab+b^2)a3+b3=(a+b)(a2−ab+b2) So: x3+1=(x+1)(x2−x+1)x^3+1=(x+1)(x^2-x+1)x3+1=(x+1)(x2−x+1)