Wednesday 24 April 2013

6. If A = find | A |


6. If
, find | A |

1
1
-2









=
2
1
-3










5
4
-9






















=
1
1
-3
-
(1)
2
-3
+
-2
2
1

4
-9
5
-9
5
4














=
1(1 x -9 - (4 x -3))
-(1)(2 x -9 - (5 x -3))
-2(2 x 4 - (5 x 1))













=
3
+
3
+
-6




















=
0












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