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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You get 2(z+3)(z-2i) I assume?
That makes sense but how would you factorise when there's an imaginary number involved? Is there a formula of some sort??
Originally Posted by zizou1089 That makes sense but how would you factorise when there's an imaginary number involved? Is there a formula of some sort?? You could use the "-b" formula if you want, i trust your familar enough with that. Assuming maddas' solution is correct has poles at so pole at and Yes it is common that in these types of problems that the poles contain imaginary numbers
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..
For example how would I factorise:
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