Question

(ii) 8a + 5a +1
factories by a cube + b cube +c cube - 3abc identity​

Answer 1

8a+5a+1

=8a+1-a+6a

=(2×3√a) ^3+(1)^3+(-3√a) ^3+3×2×3√a×1×3√a

=(2.3√a+1-3√a) (4.3√a^2+1+3√a^2+2.3√a-3√a-2.3√a^2)

=(3√a+1)(5.3√a^2+3√a+1)