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If $A=\left[\begin{array}{cc}2-k & 2 \\ 1 & 3-k\end{array}\right]$ is singular matrix, then the value of $5 k-k^2$ is equal to
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The correct answer is:
$4$
$A=\left[\begin{array}{cc}2-k & 2 \\ 1 & 3-k\end{array}\right]$ is singular matrix we know
that $A$ is singular matrix, then $|A|=0$
$|A|=(2-k)(3-k)-2$
that $A$ is singular matrix, then $|A|=0$
$|A|=(2-k)(3-k)-2$
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