*Step #1: *

Make sure the equation is in the form of [ Ax² + Bx + C = 0 ].

Yours is already in that form.

A = 1

B = 2

C = -2*Step #2:*

The ’discriminant’ for that equation is [ B² - 4 A C ].

That’s all there is to it, but it can tell you a lot about the roots of the equation.

- If the discriminant is zero, then the left side of the equation is a perfect square,

and both roots are equal.

- If the discriminant is greater than zero, the the roots are real and not equal.

- If the discriminant is less than zero, then the roots are complex numbers.

The discriminant of your equation is [ B² - 4 A C ] = 2² - 4(1)(-2) = 4 + 8 = 12

Your equation has two real, unequal roots.

\( the\ discriminant\ of\ the\ quadratic\ ax^2+bx+c=0\\\\\Delta=b^2-4\cdot a\cdot c\\-\\\\ x^2 + 2x -2 =0\\\\\Delta=2^2-4\cdot1\cdot(-2)=4+8=12\\\\discriminant=12 \)