$a{x}^2+bx+c=0$ will have two equal real roots if 

If $a{x}^2+bx+c=0$ is given quadratic equation then

1. $b^2-4ac>0$ --> eqn will have two distinct real roots

2. $b^2-4ac=0$ --> eqn will have two equal real roots

3. $b^2-4ac<0$ --> eqn will not have real roots