factories 3x2-x-4
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3x^2 - x - 4
3x^2 - ( 4 - 3 )x - 4
3x^2 - 4x + 3x - 4
x( 3x - 4 ) + 1( 3x - 4 )
(3x - 4) ( x + 1 ) Answer..................
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