Help with complex numbers?

• Nov 7th 2012, 04:00 PM
Benja303
Help with complex numbers?
question 5 in the attached pdf..

Please explain.. I know you get to a point where it is the sq root of -11 but idk what to do after this . Please help
• Nov 7th 2012, 04:21 PM
Prove It
Re: Help with complex numbers?
\displaystyle \begin{align*} \sqrt{-11} = \sqrt{-1 \cdot 11} = \sqrt{-1} \cdot \sqrt{11} = i\sqrt{11} \end{align*}
• Nov 8th 2012, 05:32 AM
topsquark
Re: Help with complex numbers?