Answer
$A^{-1}=\left[\begin{array}{rrr}
{0.01}&{0.05}&{-0.01}\\
{0.01}&{-0.02}&{0.01}\\
{-0.02}&{0.01}&{0.03}\end{array}\right]$
Work Step by Step
Our aim is to determine the inverse of the following matrix by using a graphic calculator and round-off to two decimal places.
$A=\begin{bmatrix}
25 & 61& -12\\18 & -2 & 4 \\ 8&35& 21 \end{bmatrix}$
Using a graphing calculator (or computer algebra system), we obtain the inverse matrix below:
$A^{-1}=\left[\begin{array}{rrr}
{0.01}&{0.05}&{-0.01}\\
{0.01}&{-0.02}&{0.01}\\
{-0.02}&{0.01}&{0.03}\end{array}\right]$
