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Published byAlvaro Crego Modified over 2 years ago

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Do Now: Solve each equation:

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Workbook page 21 1)yes; 7 x 3 3) yes; 2 x 6 5) yes; 1 x 1 7) 9) 11) 13)

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Workbook page 21 19) 20) 21) $526,054

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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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Expansion by Minors Always:

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6. Evaluate Finding a 3x3 determinant: Expansion by Minors Method Step 1: Expand the matrix into 3 pieces. Step 2: Evaluate each 2x2 matrix. Step 3: Simplify. 21

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Finding a 3x3 determinant: Diagonal method Step 1: Rewrite first two columns 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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Do Now: Copy down this problem. Find the area of a triangle whose vertices are located at (-1, 6), (2, 4), (0, 0).

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