Question

What is the discriminant for the following quadratic?
x^2 - 2x - 4

Answer 1

20

Explanation:

The discriminant of a quadratic is the expression inside the radical of the quadratic formula.

b^2-4(ac)

Substitute in the values of a , b , and c .

(-2)^2-4(1*-4)

Elevate the result to find the discriminant.

4+16

=20