Question
In Problems 7-14, find the value of each determinant. $\left|\begin{array}{ll}3 & 4 \\ 1 & 2\end{array}\right|$
Step 1
First, we can use the formula for a 2x2 determinant: $\left|\begin{array}{ll}a & b \\ c & d\end{array}\right| = ad - bc$ So for our given matrix: $\left|\begin{array}{ll}3 & 4 \\ 1 & 2\end{array}\right| = (3)(2) - (4)(1) = 6 - 4 = 2$ Show more…
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