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Determinants

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.

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Determinants

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  1. Determinants

  2. 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:

  3. Find the determinant:

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

  5. -224 +10 +162 = -52 -126 +12 +240 Step 2: multiply diagonals going up! Step 2: multiply diagonals going down! =126 Step 3: Bottom minus top! 126 - (-52) 126 + 52 = 178

  6. -18 +50 +6 = 38 45 - 15 + 8 Step 2: multiply diagonals going up! Step 2: multiply diagonals going down! = 38 Step 3: Bottom minus top! 38 - 38 = 0

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