MTH105 Questions and Solutions : Let \[A=\begin{bmatrix}1&4\\3&1\end{bmatrix}\] and \[B=\begin{bmatrix}3&1\\2&k\end{bmatrix}\] Given that |AB| =121, find the value of k

Let \[A=\begin{bmatrix}1&4\\3&1\end{bmatrix}\] and \[B=\begin{bmatrix}3&1\\2&k\end{bmatrix}\] Given that |AB| =121, find the value of k
a) 2
b) -3
c) -1
d) 22
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