Question
Solve for $x$$$\left|\begin{array}{ccc}1 & 0 & x \\x^{2} & 1 & 0 \\x & 0 & 1\end{array}\right|=0$$
Step 1
We can do this by expanding along the first row. The determinant of a 3x3 matrix is calculated as follows: $$\left|\begin{array}{ccc} a & b & c \\ d & e & f \\ g & h & i \end{array}\right|=a\left|\begin{array}{cc} e & f \\ h & Show more…
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