1.

(3x - 4y)(x+y) +(5x+7y)(x-y)please answer my question....

Answer»

( 3x - 4 y ) ( x+y ) + ( 5x + 7Y ) ( x-y )

=> 3x^2 + 3xy - 4xy - 4y^2 + 5x^2 - 5xy +7XY - 7y^2

=> 8x^2 + xy + 12 y^2.



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