Question

Which polynomial expression is equal to (a + 3)(a − 3)(a² + 9)?

Answer 1

a⁴ - 81

Explanation:

Identity applied :

(a + b)(a - b) = a² - b²

Simplifying :

• (a + 3)(a − 3)(a² + 9)
• (a² - 9)(a² + 9)
• a⁴ - 81