Question

Find the cube roots of 8(cos 216° + i sin 216°)

Answer 1

Do you know the law of De Moivre?

Answer 2

Nope

Answer 3

Hmm ok, it's basically a simple law but it doesn't seem quite intuitive without a deeper understanding of complex number, have you ever seen this equation, known as Eulers expression of a complex number:

\[\Large e^{i\phi}=\cos(\phi)+i\sin(\phi) \]

Answer 4

Pre-cal is horrid lol. Thank you for trying to help me, I'm just not getting it..

Answer 5

Maybe someone manages to explain you this problem without the use of it, or there are always just solution problems for this kind of a problem.

However, at it's basic I'd recommend you to get an insight into complex numbers, what their properties are and how to work with them (addition, subtraction, multiplication, division). They share a lot of properties with vectors too.

Answer 6

there are three answers, not one.