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Better split the middle term like this -- => 6 x^2 - 12 x - x + 2 = 0 => 6 x ( x - 2 ) - ( x - 2 ) = 0 => ( 6 x - 1 ) ( x - 2 ) = 0 Which gives x = 1/6 and x = 2. Hence x : [ 1/6 , 2 ] ............... Answer Answer P.K.Tandon...