Question
$15-20=$ Minors and Cofactors Evaluate the minor and cofactorusing the matrix $A .$$$A=\left[ \begin{array}{rrr}{1} & {0} & {\frac{1}{2}} \\ {-3} & {5} & {2} \\ {0} & {0} & {4}\end{array}\right]$$$$M_{12}, A_{12}$$
Step 1
To do this, we cross out the first row and the second column of the matrix $A$, which leaves us with the 2x2 matrix $\left[ \begin{array}{rr}{-3} & {2} \\ {0} & {4}\end{array}\right]$. Show more…
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