Question 26

Which of the following is correct?

Solution

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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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