I am having trouble finding the poles z1 and z2 of f defined:

Im pretty sure I have to factorise the denominator, but I keep getting the wrong answer which includes imaginary numbers, is it supposed to?

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- May 3rd 2010, 02:58 PMzizou1089Factorising Imaginary numbers
I am having trouble finding the poles z1 and z2 of f defined:

Im pretty sure I have to factorise the denominator, but I keep getting the wrong answer which includes imaginary numbers, is it supposed to? - May 3rd 2010, 06:35 PMmaddas
You get 2(z+3)(z-2i) I assume?

- May 4th 2010, 06:35 AMzizou1089
That makes sense but how would you factorise when there's an imaginary number involved? Is there a formula of some sort??

- May 4th 2010, 06:51 AMTekken
- May 4th 2010, 07:08 AMzizou1089
I tried using the '-b' formula but I get the square root of an imaginary number which I don't think should be the case..

- May 4th 2010, 09:07 AMzizou1089
For example how would I factorise: