\[M = \begin{bmatrix} 3 & -1 & 4\\ 2 & 5 & 1\\ 2 & 0 & 6 \end{bmatrix}\]
Doing this manually, I will choose the third row as the reference becuase the zero in its second column reduces the necessary minors to be calculated.
\[\therefore |M| = a_{31}|A_{31}| + a_{33}|A_{33}|\]
\[A_{31} = \begin{bmatrix} -1 & 4\\ 5 & 1\\ \end{bmatrix}\]
\[A_{33} = \begin{bmatrix} 3 & -1\\ 2 & 5\\ \end{bmatrix}\]
\[\therefore |M| = 2|-1*1 - 5*4| + 6|3*5 - 2*-1| = 2*-21 + 6*17 = 60\]