Questions
Question 1
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How many distinct complex roots does \(z^4=3-4i\) have?
Question 2
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What is the modulus of each solution of \(z^3=8\)?
Question 3
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Solve \(z^2=4\) over \(\mathbb C\).
Question 4
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Solve \(z^2=-4\).
Question 5
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Find the cube roots of \(8\) in exponential form.
Question 6
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Find all square roots of \(3+4i\).
Question 7
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Solve \(z^3=-1\) in exponential form.
Question 8
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Find the fourth roots of \(16\) in exponential form.
Question 9
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Solve \(z^3=1+i\) in polar form.
Question 10
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Solve \(z^2=2-2i\) in polar form.
Question 11
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Verify that \(2^{1/6}e^{3\pi i/4}\) is a solution of \(z^3=1+i\).
Question 12
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Explain why \(z^5=0\) has only one distinct root, not five distinct roots.
Question 13
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Find all \(z\) such that \(z^4=-16\).
Question 14
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Find all \(z\) such that \(z^3=-8i\).
Question 15
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For which positive real \(r\) do the roots of \(z^3=re^{i\pi/3}\) have modulus \(2\)?
Question 16
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For which integers \(k\) should be used to list the distinct roots of \(z^6=5e^{i\pi/7}\), and why?
Question 17
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Find all square roots of \(-3+4i\) in rectangular form.
Question 18
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A learner solves \(z^3=1+i\) using only \(\arg(1+i)=\pi/4\) and gives one root. Explain the missing step.
Question 19
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Prove that the roots of \(z^n=a\), with \(a\ne0\), are equally spaced in argument.
Question 20
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Show that if \(w\) is one solution of \(z^n=a\), then every solution is \(w\omega\), where \(\omega^n=1\).