Determinants and Cofactor Expansion

Gaussian Elimination

Matrix Inversion

Row Reduction

Cofactor Expansion

Row three is always preferred

The tutorial specifically instructs to use row three

Row three has more negative numbers

Row two is not a valid choice

The sum of all elements in the matrix

The element itself

The product of the element and its minor

The determinant of the matrix

By adding all elements in the row and column

By multiplying the element by its row number

By deleting the row and column of the element

By inverting the matrix

The first element

The second element

The third element

All elements

It reverses the sign of the determinant

It contributes zero to the determinant

It has no effect

It doubles the determinant

Undefined

Positive one

Zero

Negative one

Negative two

Positive two

Negative three

Zero

Add the diagonal elements

Subtract the product of the diagonals

Multiply all elements

Divide by the sum of the elements

Adding all elements

Subtracting the minors

Evaluating each 2x2 determinant and summing the results

Multiplying the matrix by its inverse