Question

Find the product using suitable identity :-
(a+3)(a-3)(a²+9)​

Answer 1

Answer:

We'll use the identity, (a-b)(a+b) = a²-b²

Now, (a+3)(a-3) = a² - 3² = a²-9

So, (a+3)(a-3)(a²+9) = (a²-9)(a²+9) = (a²)² - 9² = (a⁴-81)   Ans.