simplify
(12a+17b)^2 - (12a-17b)^2
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Answer:
(12a+17b)² - (12a-17b)²
(a+b)²=a²+b²+2ab
(a-b)²=a²+b²-2ab
(12a)²+(17b)²+2(12a)(17b) - [(12a)²+(17b)²-2(12a)(17b)]
144a² + 289b² + 408ab - (144a²+289b²-408ab)
144a² + 289b² + 408ab - 144a² -289b² +408ab
408ab + 408ab
816ab
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