do question no. a , d and e
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(a+3) (a-3) (a²+9)
((a+b) (a-b) = a²-b²)
⇒(a²-3²) (a²+9)
⇒(a²-3²) (a²+3²)
((a+b) (a-b) = a²-b²)
(a²)² - (3²)²
⇒ (a²)² -81 a raise to power 4