Bantu jawab yaa. Diketahui persamaan matriks(2 7 5 3). x(-3 8 7 -9) . Determinan matriks X adalah

jawab

[tex] \left[\begin{array}{ccc}2&7\\5&3\end{array}\right] [x]\,= \left[\begin{array}{ccc}-3&8\\7&-9\end{array}\right] [/tex]

[tex] [x]\,= \frac{1}{2(3)-5(7)} \left[\begin{array}{ccc}3&-7\\-5&2\end{array}\right] \left[\begin{array}{ccc}-3&8\\7&-9\end{array}\right] [/tex]

[tex][x]\,= \frac{1}{-29} \left[\begin{array}{ccc}-58&87\\29&-58\end{array}\right] \,=\,\left[\begin{array}{ccc}2&3\\-1&2\end{array}\right] [/tex]