Question

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

Answer 1

Answer:

(a⁴-81)

Step-by-step explanation:

(a+3)(a-3)(a²+9)

using the identity a²-b²=(a+b)(a-b)

=(a²-9)(a²+9)

=(a⁴-81)

Answer 2

Answer:

Step-by-step explanation:

Given that,

( a + 3 ) ( a - 3 ) ( a² + 9 )

= (a² - 9 ) ( a² + 9 ) [ ∵ Identity : a² - b² = ( a - b ) ( a + b ) ]

= ( a² )² - ( 9 )² ( Same above identity.

= a⁴ - 81 is the answer.