Find the product using suitable identity.
(a + 3) (a - 3) (a2 +9)
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(a +3) (a- 3) (a^2+9 )
Use identity a^2-b^2= (a+b)(a-b)
[a^2 - (3)^2] [a^2+9]
[a^2-9] [a^2 +9]
Use identity a^2-b^2 = (a-b)(a+b)
[(a^2)^2 - (9)^2]
a^4 - 81
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