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April 18, 2014

April 18, 2014

Posted by **ashvini** on Tuesday, October 25, 2011 at 6:05pm.

- math -
**Steve**, Wednesday, October 26, 2011 at 4:52amIf there are two distinct roots, the determinant is positive:

(-3+2k)^2 - 4(4)(1) > 0

9 - 12k + 4k^2 - 16 > 0

4k^2 - 12k -7 > 0

(2k+1)(2k-7) > 0

Either both factors are positive or both are negative

k < -1/2 or k > 7/2

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