(a) If z = -1+i then determine | z| = r and Arg( z) = 0 and write z in polar form: z = r(cos 0 + i sin 0). (b) Apply De Moivre's Theorem to express z® = (-1 + i )³ in the form a + b i . (c) Find all cube roots of z = -1+i in polar form and then plot them in the complex plane.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter11: Topics From Analytic Geometry
Section11.5: Polar Coordinates
Problem 85E
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This problem is related to De Moivre's Theorem 

(a) If z = -1+i then determine | z| = r and Arg( z) = 0 and write z in polar form:
z = r(cos 0 + i sin 0).
(b) Apply De Moivre's Theorem to express z8 = (-1 + i )8 in the form a + b i.
(c) Find all cube roots of z = -1+i in polar form and then plot them in the complex plane.
Transcribed Image Text:(a) If z = -1+i then determine | z| = r and Arg( z) = 0 and write z in polar form: z = r(cos 0 + i sin 0). (b) Apply De Moivre's Theorem to express z8 = (-1 + i )8 in the form a + b i. (c) Find all cube roots of z = -1+i in polar form and then plot them in the complex plane.
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