simplify :(2x-y+3)(2x-y-3)
ranjan63:
= 4x square - 2xy - 6x - 2xy + y square - 3y+ 6x -3y -9 = 4 x square - 4xy + y square - 6y -9
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=) 2x(2x-y-3)-y(2x-y-3)+3(2x-y-3)
=)4x^2-2xy-6x- 2xy+y^2+3y+6x-3y-9
=) 4x^2+y^2-4xy -9 [ans.]
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