The number of real values of $m$ so that the equation $x^2+(2 m+1) x+m=0$ has equal roots is
The number of real values of $m$ so that the equation $x^2+(2 m+1) x+m=0$ has equal roots is
- $1$
- $0$
- $2$
- $3$
Solution
$x^2+(2 m+1) x+m=0$
For equal roots,
$\begin{aligned} & \mathrm{D}=0 \\ & (2 m+1)^2-4 m=0 \\ & 4 m^2+1+4 m-4 m=0 \\ & 4 m^2+1=0 \\ & m^2=-1 / 4 \\ & m^2>0\end{aligned}$
No real values of $m$ exist.
Asked in: AP EAMCET 2022 (05 Jul Shift 2)
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