Next exams: Wednesday 2nd May, Thursday 3rd May, Wednesday 9th May, Thursday 17th May, Friday 18th May

To divide two complex numbers, multiply by the complex conjugate of the denominator.

## Summary/Background

A
note about graphic calculatorsA graphic calculator, for example the TI-83 or similar model, can work with complex numbers. First select MODE and move down to select a+bi:Then press 2nd QUIT and enter a complex number sum. |

## Software/Applets used on this page

## Glossary

### complex number

A number of the form a+bi where i is the square root of -1, and a and b are real.

### conjugate

of a complex number a+bi is a-bi.

### denominator

the integer on the bottom of a fraction

### mode

the value in a set of discrete data that occurs most frequently

### union

The union of two sets A and B is the set containing all the elements of A and B.

### work

Equal to F x s, where F is the force in Newtons and s is the distance travelled and is measured in Joules.