## College Algebra 7th Edition

$M= \left[ {\begin{array}{cc} -2 & 3 & -1&-2\\ 0 & -1 & 0& 1/2 \\ -2 & 2 & -1&-2\\ -1 & -1 & -1 & 0 \\ \end{array} } \right]$
We plug this into a graphing calculator as stated in the book. It is important to remember the calculator will find the inverse by solving for a second matrix, and thus the answer will be a decimal on most calculator. If using a TI calculator, pushing $\triangle frac$ will put the answer into fractions. After doing above we get... $M= \left[ {\begin{array}{cc} -2 & 3 & -1&-2\\ 0 & -1 & 0& 1/2 \\ -2 & 2 & -1&-2\\ -1 & -1 & -1 & 0 \\ \end{array} } \right]$