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. $1$
  2. $0$
  3. $2$
  4. $3$

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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