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Question

Solve for x by finding the determinant.

x+729x2=0\left|\begin{array}{cc}x+7 & -2 \\ 9 & x-2\end{array}\right|=0

Solution

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Answered 2 years ago
Answered 2 years ago
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Data from the matrix:

a11=x+7\begin{equation*} a_{11} = x+7 \end{equation*}

a12=2\begin{equation*} a_{12} = -2 \end{equation*}

a21=9\begin{equation*} a_{21} = 9 \end{equation*}

a22=x2\begin{equation*} a_{22} = x-2 \end{equation*}

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