Find the product (20+5 (2a-3 )(4a²+9)
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Step-by-step explanation:
= (2a+3)(2a-3)(4a+9)
(a+b)(a-b)=a²-b²
=(2a+3)(2a-3)(4a+9)
=(4a²-9)(4a+9)
= (4a²*4a)-(4a²*9)-(9*4a)-(9*9)
=16a³-36a²-36a-81
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