Current
Imagine this!
It's amazing what you can do when you go beyond the Real world...
Vanishing Roots Stage: 4 and 5
If $y=x^2-6x+c$, and we vary $c$, what happens to the roots when $c>9$?
Opening the Door liveStage: 4 and 5 Challenge Level: 
What happens when we add together two complex numbers?
Strolling Along liveStage: 4 and 5 Challenge Level:
What happens when we multiply a complex number by a real or an imaginary number?
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NRICH is part of the family of activities in the Millennium Mathematics Project.
NRICH is part of the family of activities in the Millennium Mathematics Project.