9000037508
Level:
B
Find the absolute value of the following complex number.
\[
\sqrt{2}\left (\cos \frac{\pi }
{3} + \mathrm{i}\sin \frac{\pi }
{3}\right )
\]
\(\sqrt{2}\)
\(\sqrt{2} + 2\)
\(2\)
\(\sqrt{2} - 2\)
Complex numbers in algebraic and polar form
9000035806
Level:
B
Given the complex numbers
\[
\text{ $a = 2\left (\cos \frac{5\pi }
{3} + \mathrm{i}\sin \frac{5\pi }
{3}\right )$, $b = 3\left (\cos \frac{11\pi }
{6} + \mathrm{i}\sin \frac{11\pi }
{6} \right )$,}
\]
find the quotient \(\frac{a}
{b}\).
\(\frac{2}
{3}\left (\cos \frac{11\pi }
{6} + \mathrm{i}\sin \frac{11\pi }
{6} \right )\)
\(\frac{2}
{3}\left (\cos \frac{\pi }
{6} + \mathrm{i}\sin \frac{\pi }
{6}\right )\)
\(\frac{2}
{3}\left (\cos \frac{5\pi }
{6} + \mathrm{i}\sin \frac{5\pi }
{6}\right )\)
\(\frac{2}
{3}\left (\cos \frac{7\pi }
{6} + \mathrm{i}\sin \frac{7\pi }
{6}\right )\)
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 \(\frac{a}
{b}\).
\(-\frac{4}
{5} -\frac{7}
{5}\mathrm{i}\)
\(2 -\frac{3}
{2}\mathrm{i}\)
\(\frac{8}
{5} -\frac{7}
{5}\mathrm{i}\)
\(\frac{4}
{3} + \frac{7}
{3}\mathrm{i}\)
9000035706
Level:
A
Find the absolute value of the complex number
\(z = \frac{2+6\mathrm{i}}
{1-2\mathrm{i}}\).
\(2\sqrt{2}\)
\(2\sqrt{5}\)
\(2\)
\(2\sqrt{3}\)
9000035708
Level:
A
Find the imaginary part of the complex number
\(z=1 + 2\mathrm{i}^{12} + 3\mathrm{i}^{19} -\mathrm{i}^{22} + 2\mathrm{i}^{105}\).
\(- 1\)
\(- 5\)
\(1\)
\(4\)
9000035707
Level:
A
Find the real part of the complex number
\(z= 2 + 2\mathrm{i}^{2} + \mathrm{i}^{3} -\mathrm{i}^{4} + 2\mathrm{i}^{5}\).
\(- 1\)
\(1\)
\(5\)
\(- 3\)
9000035802
Level:
C
Solve the following equation for \(z\in \mathbb{C}\). By \(\overline{z }\) the complex conjugate of \(z \) is denoted.
\[
3z - 2\overline{z } = 8 - 10\mathrm{i}
\]
\(8 - 2\mathrm{i}\)
\(1 + 5\mathrm{i}\)
\(8 - 10\mathrm{i}\)
\(2 + 2\mathrm{i}\)
9000035701
Level:
A
What is the algebraic form of the complex number \( A \) graphed in the complex
plane (as shown in the picture)?
\( -3 + 2\mathrm{i}\)
\( 2 - 3\mathrm{i}\)
\( 2 + 3\mathrm{i}\)
\( -3 - 2\mathrm{i}\)
9000035702
Level:
A
Find the absolute value of the complex number \( A \) graphed in the complex
plane as shown in the picture.
\(5\)
\(\sqrt{5}\)
\(3\)
\(4\)