Answer
$A^{-1}\approx\left[\begin{array}{rrr}
{0.26}&{-0.29}&{-0.20}\\
{-1.21}&{1.63}&{1.20}\\
{-1.84}&{2.53}&{1.80}\end{array}\right]$
Work Step by Step
Our aim is to determine the inverse of the following matrix by using a graphing calculator and round-off to two decimal places.
$A=\begin{bmatrix}
18 & -3& 4\\6 & -20 & 14 \\ 10&25& -15 \end{bmatrix}$
Using a graphing calculator (or computer algebra system), we obtain the inverse matrix below:
$A^{-1}\approx\left[\begin{array}{rrr}
{0.26}&{-0.29}&{-0.20}\\
{-1.21}&{1.63}&{1.20}\\
{-1.84}&{2.53}&{1.80}\end{array}\right]$
