Question

(a-c)(a^2+ac+c^2)(a^3+c^3)

Answer 1

$(a-c)(a^2+ac+c^2)(a^3+c^3)=\\(a^3-c^3)(a^3+c^3)=\\(a^3)^2-(c^3)^2=\\a^{3*2}-c^{3*2}=a^6-c^6$