(15a+16b)(15a-6b)+(12a+6b)(12a-6b)
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(a+b)(a-b) = a²-b²
(15a+16)(15a-16b)+(12a+6b)(12a-6b)
= (15a)²-(16a)² + (12a)²-(6b)²
= 225a²-256b²+144a²-36b²
= 369a²-322b²
(15a+16)(15a-16b)+(12a+6b)(12a-6b)
= (15a)²-(16a)² + (12a)²-(6b)²
= 225a²-256b²+144a²-36b²
= 369a²-322b²
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