Determinants
EXERCISE 4.1.8
If \(|\begin{smallmatrix}x&2\\
18&x\end{smallmatrix}|=|\begin{smallmatrix}6&2\\
18&6\end{smallmatrix}|\) then x is equal to (A) 6
(B) ± 6 (C) -6
If \(|\begin{smallmatrix}x&2\\
18&x\end{smallmatrix}|=|\begin{smallmatrix}6&2\\
18&6\end{smallmatrix}|\) then x is equal to (A) 6
(B) ± 6 (C) -6