Saturday 28 March 2015

complex numbers - How to solve the equation $ z^2 = i-1 $?




$\ z^2 = i-1 \ $
Hey guys, I couldn't find a way to solve this problem. The question suggests I replace $\ z\ $ with $\ x+iy\ $ and then go from there, but I always end up having to complete the square and end up with a completely different answer to the back o the book. Can you please help?
Thanks


Answer




let $$z=x+iy$$ then we get
$$x^2-y^2+2xyi=i-1$$ so we get
$$x^2-y^2+1=0$$
and $$2xy-1=0$$
Can you solve this?


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