Di ketahui matriks A = [8 4] dan B = [6 11] [2 3] [3 1 ] Jika c = A-B, invers matriks C adalah?

jawab

C = A - B

[tex] C=\left[\begin{array}{ccc}8&4\\2&3\end{array}\right] - \left[\begin{array}{ccc}6&11\\3&1\end{array}\right] =\, \left[\begin{array}{ccc}2&-7\\-1&2\end{array}\right] [/tex]

[tex]C^{-1}=\, \frac{1}{2(2)- (-1(-7) } \left[\begin{array}{ccc}2&7\\1&2\end{array}\right]\,=\, \frac{1}{-3} \left[\begin{array}{ccc}2&7\\1&2\end{array}\right]\,=\, \left[\begin{array}{ccc}-2/3&-7/3\\-1/3&-2/3\end{array}\right] [/tex]