Pearson Algebra 2 Common Core, 2011
PA
Pearson Algebra 2 Common Core, 2011 View details
3. Determinants and Inverses
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Exercise 1 Page 787

Use the formula for finding the determinant of a 2* 2 matrix.

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Practice makes perfect
The determinant of a matrix is found by subtracting the products of the diagonals. To evaluate the determinant of a 2* 2 matrix, we will use the appropriate formula. det[ cc a & b c & d ] = ad-bcWe can substitute the values from the given matrix into this formula. det[ cc 4 & -1 8 & 2 ] = 4(2)-(-1)8 Finally, we will simplify the numeric expression.
4(2)-(-1)8
4(2)-(-8)
8-(-8)
8+8
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