(3x - 4y)(x+y) +(5x+7y)(x-y)please answer my question....
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( 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.
=> 3x^2 + 3xy - 4xy - 4y^2 + 5x^2 - 5xy +7xy - 7y^2
=> 8x^2 + xy + 12 y^2.
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