#### Answer

$\left[\begin{array}{ll}
1 & -4\\
0 & 28
\end{array}\right]$

#### Work Step by Step

$\left[\begin{array}{ll}
1 & -4\\
7+1(-7) & 0+(-4)(-7)
\end{array}\right]=\left[\begin{array}{ll}
1 & -4\\
0 & 28
\end{array}\right]$

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$\left[\begin{array}{ll}
1 & -4\\
0 & 28
\end{array}\right]$

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