I found the real part $=\sqrt{6}$.
But I don't know how to find imaginary part. I thought it was whatever part of the function that involved $i$, with the $i$ removed? Therefore the imaginary part would be $-\sqrt{6}$.
Meaning the modulus is equal to
\begin{align}
\sqrt{ (\sqrt{6})^2 + (-\sqrt{6})^2} = \sqrt{12}.
\end{align}
The answer was $2\sqrt{3}$.
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