(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Harder: given that

√(−15 − 8i) = ±(1 − 4i) obtain the two solutions of the equation

z² + (−3 + 2i)z + 5 − i = 0

2. Relevant equations

I can easily prove √(−15 − 8i) = ±(1 − 4i) but that's not important

3. The attempt at a solution

I would of thought that a compex solution would be a + b and a - b, but a quick glance at the answers shows 2 completely different complex numbers - no complex conjugates.

Well seperating the equation into real and imaginary parts then solving for z:

real:

(z² - 3z + 5) = 0

=> [tex] z = \frac{3\pm i \sqrt{11}}{2}[/tex]

imag:

(2z - 1) = 0

=> z = 0.5

This isn't taking me anywhere nice...

Ideas!? :)

Thanks

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# Tricky complex numbers question

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