Question

Which number is the discriminant of a quadratic equation that has no solution?

1) 0
2) 36
3) -4
4) 5

Answer 1

-4

Explanation:

If the discriminant is negative there can be no real number solution because the square root of a negative number does not exist (in real numbers).

In the Quadratic Formula, if
`b^2-4ac` is negative, then you can't find
`√(b^2-4ac)`.