Express the complex number in polar form.
-$- 4$
A) $4 \left( \cos 180 ^ { \circ } + i \sin 180 ^ { \circ } \right)$
B) $4 \left( \cos 270 ^ { \circ } + \mathrm { i } \sin 270 ^ { \circ } \right)$
C) $4 \left( \cos 0 ^ { \circ } + i \sin 0 ^ { \circ } \right)$
D) $4 \left( \cos 90 ^ { \circ } + \mathrm { i } \sin 90 ^ { \circ } \right)$

Question

Quizplus · Accepted Answer

The complex number $-4$ can be represented in polar form as $4(\cos 180^\circ + i\sin 180^\circ)$ because it lies on the negative x-axis, which corresponds to an angle of $180^\circ$ from the positive x-axis.

Express the Complex Number in Polar Form −4- 4−4 A) 4(cos⁡180∘+isin⁡180∘)4 \left( \cos 180 ^ { \circ } + i \sin 180 ^ { \circ } \right)4(cos180∘+isin180∘)

Express the Complex Number in Polar Form $- 4$ A) $4 \left( \cos 180 ^ { \circ } + i \sin 180 ^ { \circ } \right)$