The correct option is B b2−4c≥0
Consider the standard form of a quadratic equation ax2+bx+c=0, where a,b and c are constants.
The equation has real roots if the discriminant, D=b2−4ac≥0.
Now, considering the equation x2+bx+c=0, we have
For this equation to have real roots, we must have b2−4c≥.0