Answer
$\left[\begin{array}{ll}
1 & 4\\
0 & -9
\end{array}\right]$
Work Step by Step
$\left[\begin{array}{ll}
1 & 4\\
4+1(-4) & 7+4(-4)
\end{array}\right]=\left[\begin{array}{ll}
1 & 4\\
0 & -9
\end{array}\right]$
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