Solve {ccc}{0}&{1}&{-1}{-1}&{0}&{2}{1}&{-2}&{0}

$$\left( \begin{array} { c c c } { 0 } & { 1 } & { - 1 } \\ { - 1 } & { 0 } & { 2 } \\ { 1 } & { - 2 } & { 0 } \end{array} \right)$$

Calculate Determinant

$$0$$

Steps Using Sarrus' Rule

Find the determinant of the matrix using the method of diagonals.

$$det(\left(\begin{matrix}0&1&-1\\-1&0&2\\1&-2&0\end{matrix}\right))$$

Extend the original matrix by repeating the first two columns as the fourth and fifth columns.

$$\left(\begin{matrix}0&1&-1&0&1\\-1&0&2&-1&0\\1&-2&0&1&-2\end{matrix}\right)$$

Starting at the upper left entry, multiply down along the diagonals, and add the resulting products.

$$2-\left(-\left(-2\right)\right)=0$$

Starting at the lower left entry, multiply up along the diagonals, and add the resulting products.

$$\text{true}$$

Subtract the sum of the upward diagonal products from the sum of the downward diagonal products.

$$0$$

Steps Using Expansion by Minors

Find the determinant of the matrix using the method of expansion by minors (also known as expansion by cofactors).

$$det(\left(\begin{matrix}0&1&-1\\-1&0&2\\1&-2&0\end{matrix}\right))$$

To expand by minors, multiply each element of the first row by its minor, which is the determinant of the 2\times 2 matrix created by deleting the row and column containing that element, then multiply by the element's position sign.

$$-det(\left(\begin{matrix}-1&2\\1&0\end{matrix}\right))-det(\left(\begin{matrix}-1&0\\1&-2\end{matrix}\right))$$

For the 2\times 2 matrix \left(\begin{matrix}a&b\\c&d\end{matrix}\right), the determinant is ad-bc.

$$-\left(-2\right)-\left(-\left(-2\right)\right)$$

Simplify.

$$-\left(-2\right)-2$$

Add the terms to obtain the final result.

$$0$$

Evaluate

$$\left(\begin{matrix}0&1&-1\\-1&0&2\\1&-2&0\end{matrix}\right)$$