Question 985891
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The 7 is in Row 1 and Column 3.


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ M_{1,3}\ =\ \left|\begin{array}{cc}1 & -2\\5 & 3\end{array}\right|\ =\ 3\ -\ (-10)\ =\ 13]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ A_{1,3}\ =\ (-1)^{1\,+\,3}\cdot  M_{1,3}\ =\ 13]


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it

*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \