Math: Complex Numbers?

We're learning about complex numbers and de Moivres theorem and im really confused... Here is a question: (a) Use de Moivre’s theorem to find the roots of the equation z^4 = 1 – i. (b) Draw these roots on an Argand diagram. (c) If z1 is the root in the first quadrant and z2 is the root in the second quadrant,... show more We're learning about complex numbers and de Moivres theorem and im really confused...

Here is a question:
(a) Use de Moivre’s theorem to find the roots of the equation z^4 = 1 – i.
(b) Draw these roots on an Argand diagram.
(c) If z1 is the root in the first quadrant and z2 is the root in the second quadrant, find z2/ z1 in the form a + ib.


Can you please do this problem and explain how you do it???
What exactly do they mean by roots? i dont get it..
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