Question
Solve for $x$$$\left|\begin{array}{rr}x & 4 \\-1 & x\end{array}\right|=20$$
Step 1
The determinant of a 2x2 matrix is calculated as follows: $$\left|\begin{array}{rr} a & b \\ c & d \end{array}\right|=ad-bc$$ So, for our matrix, we have: $$\left|\begin{array}{rr} x & 4 \\ -1 & x \end{array}\right|=x*x - 4*(-1)$$ Show more…
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