nilai x yang memenuhi persamaaan di atas adalah

Matriks
Kelas X

[tex] \left|\begin{array}{cc} 1 & 3 \\ 4 & x \end{array}\right| - \left|\begin{array}{cc} 2 & 2\\ -1 & x \end{array}\right| = \left|\begin{array}{cc} 3 & 1 \\ 4 & -2 \end{array}\right| [/tex]
(x - 12) - (2x + 2) = -6 - 4
x - 12 - 2x - 2 = - 10
-3x = 4
x = -4/3