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`(3x - 4y)^(2) - (4x + 3y)^(2) = "______"`.A. (7x - y) (7y-x)B. (x- 7y) (7x + y)C. (x + 7y) (7x - y)D. (y-7x ) (x + 7y)

Answer» Correct Answer - D
`(3x - 4y)^(2) - (4x + 3y)^(2)`
`= (3x - 4y + 4x + 3y) (3x - 4y - 4x -3y)`
`(because (a^(2) - b^(2)) = (a + b) (a-b))`
= `(7x - 7y) (-7y - x)`
= `(y-7x) (x + 7y)`
Hence , the correct option is (d) .


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