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Do Now: Solve each equation:. 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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Presentation on theme: "Do Now: Solve each equation:. Workbook page 21 1)yes; 7 x 3 3) yes; 2 x 6 5) yes; 1 x 1 7) 9) 11) 13)"— Presentation transcript:

1 Do Now: Solve each equation:

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

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

4 Determinants

5 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:

6 Find the determinant:

7 Expansion by Minors Always:

8 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

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

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

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

12 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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