By writing Z in polar form, we will see that:
[tex]z^3 = C[/tex]
How to get the value of Z³?
First, we can see that:
z = (-1 - i)
If we write it in polar form, we get:
[tex]z = \sqrt{2} *e^{i(\pi + \pi/4)[/tex]
If we apply the power 3, we get:
[tex]z^3 = (\sqrt{2} *e^{i(\pi + \pi/4)})^3\\\\z^3 = 2^{3/2}*e^{i*(3\pi + 3\pi/4)}\\\\z^3 = 2^{3/2}*e^{i*15\pi/4}[/tex]
Notice that:
[tex]\frac{15\pi}{4}[/tex]
Is an angle equivalent to:
[tex]\frac{15\pi}{4} - 2\pi = \frac{15\pi}{4} - \frac{8\pi}{4} = \frac{7\pi}{4} = 1.75\pi[/tex]
Because the angle is measured from the positive x-axis, this means that we will have:
[tex]z^3 = C[/tex]
If you want to learn more about complex numbers:
https://brainly.com/question/10662770
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