EQUATION & INEQUALITY X2
The dimensions of
| 1 | 3 | 3 |
| -1 | 5 | 3 |
| -1 | 5 | 3 |
The determinant of
| 1 | 3 |
| -1 | -3 |

The inverse of
| 3 | 5 |
| -3 | -5 |
What is it does not exist?
Find f(12) when
f(x) = -x if x<3 x-6 if 3< x <12 x if x >12

A=
| 3 | 5 |
| -3 | 5 |
| 0 | 4 |
B=
| 1 | -1 | 1 |
| 2 | 5 | -5 |
A=
| 1 | -1 | 1 |
| 2 | 5 | -5 |
B=
| 3 | 5 |
| -3 | 5 |
| 0 | 4 |
| 13 | 22 | -22 |
| 7 | 28 | -28 |
| 8 | 20 | -20 |