If the equation $4 x^2+h x y+y^2=0$ represent coincident lines, then ' $h$ ' is equal to
If the equation $4 x^2+h x y+y^2=0$ represent coincident lines, then ' $h$ ' is equal to
1
2
3
4
Solution
Since the equation $4 x^2+h x y+y^2=0$ represents the coincident lines, then
$
\begin{aligned}
\left(\frac{h}{2}\right)^2-4 & \times 1=0 \\
\Rightarrow h & =-4,4
\end{aligned}
$
Hence, option (4) is correct