Determinants. Determinant - a square array of numbers or variables enclosed between parallel vertical bars. **To find a determinant you must have a SQUARE.

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Presentation transcript:

Determinants

Determinant - a square array of numbers or variables enclosed between parallel vertical bars. **To find a determinant you must have a SQUARE MATRIX!!** Finding a 2 x 2 determinant:

Find the determinant:

Finding a 3x3 determinant: Diagonal method Step 1: Rewrite first two rows of the matrix.

Step 2: multiply diagonals going up! = -52 Step 2: multiply diagonals going down! =126 Step 3: Bottom minus top! (-52) = 178

Step 2: multiply diagonals going up! = 38 Step 2: multiply diagonals going down! = 38 Step 3: Bottom minus top! = 0