① [4x -5y) (5x-4y) simplify
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Step-by-step explanation:
=(4x-5y) (5x-4y)
=4x(5x-4y)-5y(5x-4y)
= 20x^2 - 16xy - 25xy + 20y^2
= 20x^2 - 41xy +20y^2. ---------------- Answer
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