Question

Expand and simplify each of the following.
(a) 9a^2 – (3a + 2) (3a - 2)​

Answer 1

Answer:

9a² - (3a + 2)(3a - 2)

= 9a² - [ (3a)² - 2² ]

= 9a² - [ 9a² - 4 ]

= 9a² - 9a² + 4

= 4

Hope that helps

Answer 2

Answer:

=9a^2-((3a)^2-2^2)

=9a^2-9a^2-4=4