Solve the Equation for X $$\left| \begin{array} { l l } x & 1 \\2 & x\end{array} \right| = - 1$$

Multiple Choice

Solve the equation for x.
- $$\left| \begin{array} { l l } x & 1 \\2 & x\end{array} \right| = - 1$$

A) $\{ - 1 \}$
B) $\{ - 1,1 \}$
C) $\{ 1 \}$
D) $\varnothing$