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### Number and algebra

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# Complex Numbers Further

### A Brief Introduction to Complex Numbers

### A Brief Introduction to the Argand Diagram

### Complex Squares

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Age 14 to 18

Challenge Level

In this problem, we define complex numbers and invite you to explore what happens when you add and multiply them.

Age 14 to 18

Challenge Level

Complex numbers can be represented graphically using an Argand diagram. This problem explains more...

Age 16 to 18

Challenge Level

What happens when we square complex numbers? Can the square of a complex number be real?