Question

(3a – 2) (3a + 2) – (a – 4)²​

Answer 1

[ (3a - 2) × (3a + 2) ] - (a - 4)^2

[ (3a)^2 - (2)^2 ] - ( a^2 - 8a + 16)

9a^2 - 4 - a^2 + 8a - 16

8a^2 + 8a - 20

Hope it helps