Question

( x-9) ( x+9)

use a suitable identity to get each of the following products .​

Answer 1

Step-by-step explanation:

(x-9)(x+9)

=(x)^2-(9)^2

=x^2-81

Answer 2

Answer:

(x-9) (x+9)

this is like (a+b)(a-b)=a^2-b^2

therefore

x^2-9^2

x^2-81