9000035705
Level:
A
Find the absolute value of the complex number
\(z = (1 - 2\mathrm{i})(2 + \mathrm{i})\).
\(5\)
\(3\)
\(\sqrt{10}\)
\(2\sqrt{2}\)
A
9000035801
Level:
A
Find the complex conjugate of the following complex number.
\[
\mathrm{i} + 3\mathrm{i}(2 -\mathrm{i})^{2} - 4(1 -\mathrm{i})^{3}
\]
\(20 - 18\mathrm{i}\)
\(20 - 24\mathrm{i}\)
\(20 + 18\mathrm{i}\)
\(- 8 + 26\mathrm{i}\)
9000035803
Level:
A
Given the complex number \(z = -1 + 2\mathrm{i}\),
find the imaginary part of the complex number
\(\frac{1}
{z}\).
\(-\frac{2}
{5}\)
\(\frac{1}
{2}\)
\(\frac{2}
{5}\)
\(-\frac{1}
{2}\)
9000035804
Level:
A
Find the algebraic form of the following complex number. By \(\overline{z }\) the complex conjugate of \(z \) is denoted.
\[
\overline{\overline{(2 + \mathrm{i}) }\; \overline{(3 + 2\mathrm{i}) } }
\]
\(4 + 7\mathrm{i}\)
\(8 + 7\mathrm{i}\)
\(8 - 7\mathrm{i}\)
\(4 - 7\mathrm{i}\)
9000035709
Level:
A
Simplify \((1 -\mathrm{i})^{-3}\).
\(-\frac{1}
{4} + \frac{1}
{4}\mathrm{i}\)
\(1 + 3\mathrm{i}\)
\(- 2 - 2\mathrm{i}\)
\(\frac{1}
{2} + \frac{1}
{2}\mathrm{i}\)
9000035809
Level:
A
Given the complex number \(z = -1 + \mathrm{i}\),
find the angle in the polar form of the number
\(z^{6}\).
\(\frac{\pi }
{2}\)
\(\frac{3\pi }
{2}\)
\(\frac{3\pi }
{4}\)
\(\frac{7\pi }
{4}\)
9000035603
Level:
A
Find the solution set of the following equation.
\[
4x^{2} + 9 = 0
\]
\(\left \{-\frac{3}
{2}\mathrm{i}; \frac{3}
{2}\mathrm{i}\right \}\)
\(\left \{-\frac{2}
{3}\mathrm{i}; \frac{2}
{3}\mathrm{i}\right \}\)
\(\left \{-\frac{9}
{4}\mathrm{i}; \frac{9}
{4}\mathrm{i}\right \}\)
\(\left \{-\frac{3}
{2}; \frac{3}
{2}\right \}\)
9000035808
Level:
A
Evaluate \((1 -\mathrm{i})^{10}\).
\(- 32\mathrm{i}\)
\(32\)
\(32\mathrm{i}\)
\(- 32\)
9000035710
Level:
A
Find the complex conjugate of \(z=\frac{3+\mathrm{i}}
{2-\mathrm{i}} + (\mathrm{i} + 1)(2 + \mathrm{i})\).
\(2 - 4\mathrm{i}\)
\(2 + 4\mathrm{i}\)
\(- 2 - 4\mathrm{i}\)
\(- 2 + 4\mathrm{i}\)
9000035807
Level:
A
Given the complex numbers \(a = 2 - 3\mathrm{i}\),
\(b = 1 + 2\mathrm{i}\), find the
quotient \(\frac{a}
{b}\).
\(-\frac{4}
{5} -\frac{7}
{5}\mathrm{i}\)
\(2 -\frac{3}
{2}\mathrm{i}\)
\(\frac{8}
{5} -\frac{7}
{5}\mathrm{i}\)
\(\frac{4}
{3} + \frac{7}
{3}\mathrm{i}\)