Ok the problem is,

Given:

|r s t|

|u v w| = 4

|x y z|

Evaluate:

|-x -y -z|

|r s t|

|u v w|

My steps at finding the solution are:

1.

|r s t|

(-)|-x -y -z|

|u v w|

2.

|r s t|

(-)(-)|u v w|

|-x -y -z|

3.

|r s t|

(-)(-)(-1)|u v w|

|x y z|

4. (-)(-)(-1)(4)= -4

Which for some reason is wrong because I am supposed to show that it equals 4 not -4. What am I doing wrong?