Evaluate $2 \times 2$ Determinant $$\left| \begin{array} { l l } 3 & 2 \\1 & 7\end{array} \right|$$

Short Answer

Evaluate $2 \times 2$ determinant. $$\left| \begin{array} { l l } 3 & 2 \\1 & 7\end{array} \right|$$ Please enter your answer as a number.