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2016-03-01T19:21:14+05:30

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D=b^2-4ac D=(-7)^2-4×2×12 =49-96 =-47 -47<0 D<0 Roots are not real they are imagenry
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2016-03-01T19:23:35+05:30

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 x^{2} - 4x - 3x + 12

 x ( x - 4x ) - 3 ( x - 4x )

( x - 4x ) ( x- 3x )

⇒ x = 4 , x = 3
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We have to find nature of roots not root