Determinan matriks B yang memenuhi persamaan  [tex]\left(\begin{array}{ccc}-4& &2\\ & & \\5& &-2\end{array}\right) = B \left(\begin{array}{ccc}9& &-1\\ & & \\-1

sekali lagi angkanya jelek alias pecahan :V[tex]B = \left[\begin{array}{ccc}-4&2\\5&-2\end{array}\right] \frac{1}{18-10} \left[\begin{array}{ccc}2&1\\10&9\end{array}\right] \\ B = \left[\begin{array}{ccc}-4&2\\5&-2\end{array}\right] \frac{1}{8} \left[\begin{array}{ccc}2&1\\10&9\end{array}\right] \\ B = \left[\begin{array}{ccc}-4&2\\5&-2\end{array}\right] \left[\begin{array}{ccc}\frac{2}{8}&\frac{1}{8}\\\frac{10}{8}&\frac{9}{8}\end{array}\right] [/tex]
[tex]B = \left[\begin{array}{ccc}-4&2\\5&-2\end{array}\right] \left[\begin{array}{ccc}\frac{2}{8}&\frac{1}{8}\\\frac{10}{8}&\frac{9}{8}\end{array}\right] \\ B = \left[\begin{array}{ccc}\frac{-8}{8}+\frac{20}{8}&\frac{-4}{8}+\frac{18}{8}\\\frac{10}{8}-\frac{20}{8}&\frac{5}{8}-\frac{18}{8}\end{array}\right] \\ B = \left[\begin{array}{ccc}\frac{12}{8}&\frac{14}{8}\\\frac{-10}{8}&\frac{-13}{8}\end{array}\right] \\[/tex]
[tex]B = \left[\begin{array}{ccc}\frac{6}{4}&\frac{7}{4}\\\frac{-10}{8}&\frac{-13}{8}\end{array} \right] [/tex]

* Determinan
= (6/4)(-13/8) - (7/4)(-10/8)
= -78/32 - (-70/32)
= -78/32 + 70/32
= -8/32
= -1/4