# Complex numbers

1. Aug 5, 2009

### forty

It's been a long time since I've had to do this stuff so bare with me!

Compute and graph the following:

(a) -15+i/4+2i (multiply by the conjugate and I got -2.9+1.7i

(b) (271/3)4 Now for some reason I have a feeling this has 3 solutions using complex numbers but can not figure them out, I've tried using polar coordinates and tried googling/wikipedia for help on this I'm just really stuck.

(c) 27(4 + 1/3) I presume this can also have 3 solutions if i split it up into 271/3 times 274

Any help on this greatly appreciated.

2. Aug 5, 2009

### jmb

That's correct.

To start, try considering the simpler $z=27^{1/3}$ and then writing $z$ out in exponential form...

Let me know if that hint isn't enough.

It sounds like once you have done (b) you should be able to do this.

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