Question

Evaluate the determinant for the following matrix:

Answer 1

The determinat of

| a     b |
|           |
|c      d |

is: a*d - b*c

So the determinant of:

|3    -5 |
|           |
|1       1 |

is 3 * 1 - 1 * (-5) = 3 + 5 = 8

Answer: option D. 8