KUIS MATEMATIKA Kode: 06-2-5

Ingat rumus invers
A⁻¹=1/ad-bc [tex]\left[\begin{array}{ccc}d&-b\\-c&a\end{array}\right] \\[/tex]

[tex] A= \left[\begin{array}{ccc}3&2\\4&1\end{array}\right] \\ B=Invers dari matriks A \\ C=\left[\begin{array}{ccc}5&-3\\-3&2\end{array}\right] \\ D=\left[\begin{array}{ccc}2&3\\3&5\end{array}\right] \\\\ C+D = \left[\begin{array}{ccc}5&-3\\-3&2\end{array}\right] +\left[\begin{array}{ccc}5&-3\\-3&2\end{array}\right] \\ C+D = \left[\begin{array}{ccc}7&0\\0&7\end{array}\right] (D)\\ Semoga Membantu[/tex]

entri diagonal utama Matriks B merupakan entri diagonal utama A yg ditukar. Entri diagonal samping matriks B merupakan entri diagonal samping A yg dinegatifkan sehingga
D = ( 2 3 | 3 5) yg didapat dr matriks C dgn ketentuan tersebut, sehingga C + D = (7 0 | 0 7)