Not sure if this is the right place to post (but its related to a complex analysis questions)(adsbygoogle = window.adsbygoogle || []).push({});

I'm doing a past paper for my revision and am stuck at the first hurdle. I simply cannot factor this polynomial in z for the life of me. I've tried completing the square and the usual quadratic formula but do not get the answer as given.

I know what the answers are supposed to be so if anyone could help walk me through how you get there and if there is a technique of generally doing so I'd be most grateful.

[tex] z^2-(2i+4)z + 8i = (z-4)(z+2i) [/tex]

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# Factorzing polynomials with complex coefficients

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