Question

What is the discriminant of the quadratic equation 0 = –x2 + 4x – 2?

Answer 1

When the equation is of the form

... ax² +bx +c = 0

the discriminant is

... d = b² -4ac

Here, your equation is in the appropriate form, so we can identify

... a = -1, b = 4, c = -2

and calculate the discriminant as

... d = 4² - 4(-1)(-2) = 16 - 8 = 8

The discriminant is 8.