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To find the four complex fourth roots of unity and plot them.
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Answer to Problem 61AYU
The four complex roots of unity are
Explanation of Solution
1 can be written as the
Rewrite 1 in the form
The magnitude of 1,
The distinct complex roots of
are
, where
is a complex number,
and
The complex roots of are
Where
Substitute 0 for in
to get the first complex root of 1.
Substitute 1 for k in to get the second complex root of 1.
Substitute 2 for k in to get the third complex root of 1.
Substitute 3 for k in to get the fourth complex root of 1.
Therefore, the four complex roots of unity are
The four complex roots has the same magnitude, 1. So, they are at the same distance from the origin. Also, the arguments of the cube roots are respectively and the argument between two consecutive pairs is
Chapter 9 Solutions
Precalculus
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