Question
Find all $t$ such that(a) $\left|\begin{array}{cc}t-4 & 3 \\ 2 & t-9\end{array}\right|=0$(b) $\left|\begin{array}{cc}t-1 & 4 \\ 3 & t-2\end{array}\right|=0$
Step 1
The determinant of a 2x2 matrix $\begin{pmatrix} a & b \\ c & d \end{pmatrix}$ is given by $ad - bc$. Show more…
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