### An Introduction to Complex Numbers

A short introduction to complex numbers written primarily for students aged 14 to 19.

### Cube Roots

Evaluate without a calculator: (5 sqrt2 + 7)^{1/3} - (5 sqrt2 - 7)^1/3}.

### Root Tracker

Track the roots of quadratic equations as you move the corresponding graphs and discover the transitions from real to complex roots.

# Complex Rotations

##### Stage: 5 Challenge Level:

The algebra of complex numbers is just like the algebra of real numbers and the only extra information you need to use is that $i^2=-1$.