What is the value of the discriminant for the quadratic equation 0=x+2+x^2? discriminant =b^2-4ac

The equation in the form 0 = ax^2 + bx + c is:
0 = x^2 + x + 2

The discriminant = b^2 - 4ac
Discriminant = (1)^2 - 4(1)(2)
= 1 - 8
= -7

Hmm confusing don't understand