no 67 tolooong kakakak

Invers Matrik

[tex]A^{-1} \ = \frac{1}{(2.1 -1.4)} \left[\begin{array}{ccc}1&-4\\-1&2\end{array}\right]\\ A^{-1} \ = \frac{1}{-2} \left[\begin{array}{ccc}1&-4\\-1&2\end{array}\right]\\[/tex]