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Published byAugustus Miles Modified over 6 years ago

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Determinants

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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:

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Find the determinant:

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

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

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

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