The imaginary unit i's Full Profile
This is where math starts to get really cool. It may see strange to define a number whose square is negative one. Why do we do this? Because it fits a nice niche in the math ecosystem and can be used to solve problems in engineering and science (not to mention some of the coolest fractals are based on imaginary and complex numbers). The more you think about it, you might realize that all numbers, not just i, are very abstract.
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- Level of Difficulty: Beginner
- Size: One-on-One
- Instructor: Sal Khan
- Cost: Free
- Institution: Khan Academy
- Topics: General Mathematics, Precalculus
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