Question

if the discriminant of an equation is zero, which of the following is true of the equation.
A. it has two complex solutions.
B. it has one real solution.
C. it has two real solutions.

Answer 1

got it its C

Answer 2

The quadratic formula reduces the solutions to:
\[x=\frac{ -b \pm \sqrt{0} }{ 2a }=\frac{ -b}{ 2a }\]
which gives only one real solution.

Answer 3

2 real solutions requires that the discriminant be positive.