Question

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

Answer 1

Answer:

Hey mate! Here's your answer:

Step-by-step explanation:

(a + 3)(a - 3)(a² + 9).

By using (a + b)(a - b) = a² - b²,

(a² - 3²)(a² + 9)

(a² - 9)(a² + 9).

By again using (a + b)(a - b) = a² - b²,

(a²)² - 9²

a⁴ - 81.

So (a + 3)(a - 3)(a² + 9) = a⁴ - 81.

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