Using the idenentity (a-b)^2 =a^2-2ab+b^2 to compute (5a-4b)^2
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Answer:
(5a-4b)²=(5a)²+(4b)²-2×5a×4b
25a²+16b²-40ab
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Answer:(5a-4b)²=25a²-2×5a×4b+16b²
25a²-40ab+16b²
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