Simplify: (4m – 5n)2 + (5m −4n)2
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Step-by-step explanation:
(4m - 5n)2 + (5m −4n)2 = 2(4m -5n+5m-4n) = 2(9m-9n) = 2×9×(m-n) = 18(m - n)
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