let, $\displaystyle \ T =
\[\begin{bmatrix}
1 & 3 & -7 \\
2 & -1 & 0 \\
3 & -1 & -1\\
4 & -3 & -2
\end{bmatrix}
\]$
determine a basis for the (a) range space of $\displaystyle T$ and (b) null space of $\displaystyle T$

well,i know that Null space of the matrix is the collection of $\displaystyle X$s where $\displaystyle TX=O$
and range of $\displaystyle T$ is the collection of all possible linear combinations of the column vectors of $\displaystyle T$. from this, how can i get the answers?