Quadratic Equation: Complex Roots

Recall that
for a quadratic equation
ax² + bx + c = 0
(a ≠ 0),

x = [-b ± √b² - 4ac] / 2a.

This is the quadratic formula.

Let's use this
to find the complex roots.

Recall that
the discriminant D determines
the nature of the roots.

If you know what a complex number is,
you can describe the last case differently.

If D is minus (< 0),
then the quadratic equation has
two complex roots.

Two complex roots are not real roots.
So the previous word,
no real roots,
is true.