Question

A quadratic equation has exactly one real number solution. Which is the value of its discriminant?

Answer 1

Answer:  0

The discriminant is the number under the square root of the quadratic formula

$x = \frac{-b\pm\sqrt{b^2-4ac}}{2a}$

The discriminant formula is $D = b^2-4ac$

If D = 0, then the whole square root portion is 0 meaning we end up with the solution $x = -\frac{b}{2a}$