Q. If the equation $4x^{2} + hxy + y^{2} = 0$ represent coincident lines, then $h$ is equal to
A) 1
B) 3
C) 2
D) 4
Explanation
(d)
The given equation represent coincident lines, if $h^{2} - ab = 0$
$\Rightarrow \ \left( \frac{h}{2} \right)^{2} - 4 \bullet 1 = 0\ \Rightarrow \ h = \pm 4$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.