(5a-4b)²=(5a)²-2·5a·4b+(4b)²=25a²-40ab+16b²
(a-b)²=a²-2ab+b²
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(5a-4b)²=(5a)²-2·5a·4b+(4b)²=25a²-40ab+16b²
(a-b)²=a²-2ab+b²