Find the product using suitable identity (a+3)(a-3)(a+9)
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Answer:
(a + 3)(a - 3)(a + 9) = a³ + 9a² - 9a - 9²
Step-by-step explanation:
(a + 3)(a - 3)(a + 9)
= a(a - 3) + 3(a - 3)(a + 9)
= a² - 3a + 3a - 9(a + 9)
= (a² - 9)(a + 9)
= a²(a + 9) - 9(a + 9)
= a³ + 9a² - 9a - 81
= a³ + 9a² - 9a - 9²
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