How do you find the determinant of ((-9, -7), (4, 5))?

1 Answer
Feb 9, 2016

The determinant is -17.

Explanation:

For a 2 times 2 matrix

A = ( (a, b), (c, d)) ,

the determinant can be computed as

|A| = a * d - b * c

Thus, in your example,

abs( ( (-9, -7), (4, 5) ) ) = -9 * 5 - (-7)* 4 = -45 + 28 = -17