A) Real and coincident
B) Real and different
C) Imaginary and different
D) None of the above
Correct Answer: A
Solution :
\[4{{x}^{2}}+12xy+9{{y}^{2}}=0\] Here\[{{h}^{2}}-ab=36-36=0\], \[\left( \text{from}\tan \theta =\frac{\pm 2\sqrt{{{h}^{2}}-ab}}{a+b} \right)\] Hence, lines are real and coincident.
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