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Solution
Expression : $$(4x + 5y) (5x - 4y)$$
= $$4x(5x - 4y) + 5y(5x - 4y)$$
= $$20x^2 - 16xy + 25xy - 20y^2$$
= $$20x^2 + 9xy - 20y^2$$
=> Ans - (A)
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