## Quadratic Equations with Complex Roots

Factorisation is the normal method of solving quadratics e.g. the big
X method. But sometimes this cannot be done and the following formula
can be used.

The equation
has the
roots given by the formula

**Example**

Solve the equation
which is
of the form
therefore

a=1 b=-4 and c=13 plug this into the above equation