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