matriks A(3 1)dibawahnya( 5 2) dan B(-2 -3)dibawahnya(3 4), matriks (AB)—¹=

jawab

[tex] (AB) = \left[\begin{array}{ccc}3&1\\5&2\end{array}\right] \left[\begin{array}{ccc}-2&-3\\3&4\end{array}\right]\,= \left[\begin{array}{ccc}-3&-5\\-4&-7\end{array}\right] [/tex]

[tex] (AB)^{-1} = \frac{1}{21-20} \left[\begin{array}{ccc}-7&5\\4&-3\end{array}\right] [/tex]

[tex] (AB)^{-1} = \left[\begin{array}{ccc}-7&5\\4&-3\end{array}\right][/tex]