Step-by-step explanation:
(2a+3)(2a+3)
4a²+6a+6a+9
=4a²+12a+9
(2a+3)(2a-3)
4a²-6a+6a-9
=4a²-9
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Step-by-step explanation:
(2a+3)(2a+3)
4a²+6a+6a+9
=4a²+12a+9
(2a+3)(2a-3)
4a²-6a+6a-9
=4a²-9