Math Help - Reduce the matrix to normal form

1. Reduce the matrix to normal form

Question : Reduce the matrix $
\begin{bmatrix} 1 & 3 & 6 & -1 \\ 1 & 4 & 5 & 1 \\ 1 & 5 & 4 & 3 \end{bmatrix}$

to normal form and hence find its rank

2. Normal Form of A Matrix is:

$\begin{pmatrix}
1 &0 &0 &0\\
0 &1 &0 &0\\
0 &0 &0 &0\\
\end{pmatrix}$

and Hence Rank is 2