Concept explainers
To find: The roots of the eighth root of 1 and sketch the roots in the complex plane.
Answer to Problem 37E
The roots of eighth root of 1 are
Explanation of Solution
Theorem used:
Roots of a
Let
Calculation:
Rewrite the complex number 1 in polar form.
The polar form of the complex number
Consider the complex number 1.
Obtain the argument of the complex number 1.
Thus, the argument of argument of the complex number 1 is
Obtain the modulus of the complex number 1.
Thus, the value of
Therefore, the polar form of the complex number 1 is
By the above theorem, the roots of eighth root of 1 are
Use online calculator to sketch the roots in the complex plane as shown below in Figure 1.
From figure 1, it is observed that all roots of eighth root of 1 form a circle on complex plane.
Chapter I Solutions
Single Variable Calculus: Concepts and Contexts, Enhanced Edition
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