Question

use suitable identity to evaluate (2z+3)²-(2z-3)²​

Answer 1

Answer:

4z^2-9

Step-by-step explanation:

(2z+3)^2-(2z-3)^2

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

(2z)^2-(3)^2

4z^2-9

Answer 2

=4z^2 +12z +9-(4z^2 -12z+9)
=24z