9(a-b)²-25(a+b)²
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9(a-b)²-25(a+b)²
9(a-b)²-25(a+b)²
9(a-b)²-25(a+b)²
9(a-b)²-25(a+b)²
=[3(a-b)+5(a+b)][3(a-b)-5(a+b)]
=(8a+2b)(-2a-8b)
=-4(4a+b)(a+4b)
(3(a-b)-5(a+b))(3(a-b)+5(a+b))=(-2a-8b)(8a+2b)