# Summary of Chapter 3 | Complex Number | Use of Complex Number | June 2017

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*WHAT IS COMPLEX NUMBER? WHEN ARE WE GOING TO APPLY IT? *

In learning about complex numbers, students will have a question "when are we going to use the complex number in real life"*WHAT IS COMPLEX NUMBER? WHEN ARE WE GOING TO APPLY IT?*

The first answer to this question when we encounter the following math problem.

By google search when we search for square root - 1, it will give squarex= √ - 1

*root(-1) = i.*

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