Question

solve 9a2-81b2 by using formula of identities​

Answer 1

Answer:

9a^2- 54ab+ 81b^2

Step-by-step explanation:

(3a)^2-(9b)^2              [a^2-b^2=a^2-2ab+b^2]

(3a)^2- 2x3ax9b+ (9b)^2

9a^2- 54ab+ 81b^2