Author Topic: how do i work out the argurment and modulus (Read 698 times) Tweet Share

1i1ii1i · « **on:** April 04, 2012, 07:53:42 pm »

How do i work out the arg and modulus of:
a) 2-2root3i
b)(2-2root3i)^2

kensan · « **Reply #1 on:** April 04, 2012, 08:09:46 pm »

There should be clear definitions in your text book,
General form $x+yi$
For modulus it is $\sqrt{x^2+y^2}$
And argument is $\tan \theta=\frac{y}{x}$

1i1ii1i · « **Reply #2 on:** April 04, 2012, 08:11:27 pm »

Yes but i can't get the modulus i got (12-8root3)i +4 for part b but the answer is 16

aznxD · « **Reply #3 on:** April 04, 2012, 08:14:40 pm »

Convert 2-2root3i to polar form and apply De moivre's theorem

1i1ii1i · « **Reply #4 on:** April 04, 2012, 08:16:03 pm »

omg thank you makes sense now

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