pair-st-lines

Question: The gradient of one of the lines ${{x}^{2}}+hxy+2{{y}^{2}}=0$ is twice that of the other, then $h =$



1) $\pm \,3$
2) $\pm \,\frac{3}{2}$
3) $\pm \,2$
4) $\pm \,1$
Solution: Explanation: No Explanation
Equation of pair of straight lines

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