Factorisation of a^9 - b^9

Factorise a raise to 9 b raise to 9

solution:-

=a^9 - b^9

=(a^3)^3 - (b^3)^3

we know that 

 a^3- b^3 = (a-b) (a^2 +ab +b^2) 

using this formula 

 (a^3 - b^3)  {(a^3)^2 +a^3b^3+ (b^3)^2)}

(a-b) (a^2 +ab +b^2) (a^6 +a^3b^3+ (b^6) Answer... 

See video