(adsbygoogle = window.adsbygoogle || []).push({}); First problem

z^2+2z+1=0

where the z in 2z is the conjugate (has a little line ontop)

I just ignored the conjugate because I wasn't sure how to solve it, and I got -1 which is one of the solutions but there's also 1+2i and 1-2i which I understand because they're both conjugate of each other but I don't understand how they got it.

Second problem

z^3-3z^2+4z-12=0 given 2i is a solution... I don't even understand what they mean.

Please help!

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# COMPLEX SOLUTIONS help!

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