Question

Find the product using suitable identity.
(a + 3) (a - 3) (a? +9)​

Answer 1

Step-by-step explanation:

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

(a^2-9 ) (a^2+ 9)

a^4 -9a^2 + 9a^2-81

a^2( a^2 - 9) +9( a^2-9)

(a^2+ 9) (a^2- 9)

a^2= 9,-9

a = 3,-3