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# Review of Complex Numbers

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In this lesson, we will review some of the main concepts involved with complex numbers. We will start with the definition of the imaginary unit i. The imaginary unit i allows us to work with the square root of a negative number. We will then move on to define a complex number in standard form as: a + bi. Next, we will review how to perform basic operations with complex numbers such as addition, subtraction, multiplication, and division. Next, we will review how to simplify powers of the imaginary unit i. Lastly, we will revisit how to plot complex numbers on the complex plane and find the absolute value of a complex number.

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