pair-st-lines

Question: If one of the line represented by the equation $a{{x}^{2}}+2hxy+b{{y}^{2}}=0$ is coincident with one of the line represented by ${a}'{{x}^{2}}+2{h}'xy+{b}'{{y}^{2}}=0$, then



1) ${{(a{b}'-{a}'b)}^{2}}=4(a{h}'-{a}'h)\,(h{b}'-{h}'b)$
2) ${{(a{b}'+{a}'b)}^{2}}=4(a{h}'-{a}'h)\,(h{b}'-{h}'b)$
3) ${{(a{b}'-{a}'b)}^{2}}=(a{h}'-{a}'h)\,(h{b}'-{h}'b)$
4) None of these
Solution: Explanation: No Explanation
Equation of pair of straight lines

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