Question

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

Answer 1

Answer:

a^4 - 81

Step-by-step explanation:

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

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

(a^2-9)(a^2+9) = a^4 - 81