The transformation $\text E\,\vec{x}$ is defined by the following matrix.
$\text E = \left[\begin{array}{rr}1 & -2 & -3& 0\\
0 & 1 & -2 & 1\\
-4 & -4 & 7 &6\\
0 & 1 & 1 & 0\end{array}\right]$
**Find the result of $\text E\,\vec{v}$ for $\vec{v}=\left[\begin{array}{r}9 \\ -2 \\ -8 \\5\end{array}\right]$.**
[[☃ matrix 1]]