34 lines
1.0 KiB
Markdown
34 lines
1.0 KiB
Markdown
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---
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title: Complex Numbers Introduction
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---
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## Complex Numbers Introduction
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A complex number is any number that can be expressed in the form of z = a + ib.
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a is called the real part of the complex number, and b is called the imaginary part.
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#### Note
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A pure imaginary number or a pure real number is also a complex number.
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#### Examples
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1. What is the real part of 2i+1?
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A. Real part : 1
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2. What is the imaginary part of 2 - 4i?
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A. Imaginary part : -4
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3. Is it a complex number z = 2i?
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A. Yes , because we can write this number as z = 0 + 2i.
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4. Is it a complex number z = 4?
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A. Yes , because we can write this number as z = 4 + 0i.
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#### More Information:
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<!-- Please add any articles you think might be helpful to read before writing the article -->
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- [Wikipedia : Complex Numbers](https://en.wikipedia.org/wiki/Complex_number)
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- [More Information](https://www.khanacademy.org/math/algebra2/introduction-to-complex-numbers-algebra-2/the-complex-numbers-algebra-2/a/intro-to-complex-numbers)
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