October 2015
Beginner
408 pages
7h 26m
English
Content preview from Fundamentals of Technical MathematicsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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3.3. Complex numbers
Complex numbers are used in engineering, science, and other technology applications, especially, in control engineering.
Definition of complex number
A complex number is a number that can be written in standard form as a + bi, where a and b are real numbers and i is an imaginary unit 
.
.We call a the real part of the complex number and bi the imaginary part of the complex number. The imaginary unit (number) i is sometimes denoted by j.
For a complex number, z has the rectangular form as z = x + yi, where x and y are real numbers,
For example, the following are complex numbers:
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