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Added complex number graphing (#23687)

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viviantran27
2018-12-28 14:14:07 -05:00
committed by Randell Dawson
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guide/english/mathematics/complex-numbers-introduction/index.md
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@ -15,8 +15,17 @@ However, with complex numbers this is [no longer](https://math.stackexchange.com
With this in mind, looking at our examples above again we see that 3 + 4i has magnitude sqrt(9 + 16) = sqrt(25) = 5, while i has size 1 and 2 has size 2. In particular, our notion of size is compatible with that of the size of a real number.
Geometrically, complex numbers can be plotted on the two-dimensional complex plane in the form (a,b).
![i](https://upload.wikimedia.org/wikipedia/commons/thumb/a/af/Complex_number_illustration.svg/220px-Complex_number_illustration.svg.png)
#### Examples
1. What is the real part of 2i+1?
A. Real part : 1
### Similarities to Real Numbers
Any complex numbers z = a + bi and w = c + di can be added
```
z + w = (a + c) + (b + d)i