Question

use a suitable identity to get the product of (7a-9b) (7a+9b). write the identity also​

Answer 1

Answer:

49a^2-81b^2

Step-by-step explanation:

(7a-9b)(7a+9b)

identity used = (a-b)(a+b)=a^2-b^2

= (7a)^2-(9b)^2

=49a^2-81b^2