Is |
|
|
|
a
b
=
r
r Are the vectors 
a and 
rb
r
equal Solution We have 
2
2
|
|
1
2
5
a =
+
=
r
 and 
2
2
|
|
2
1
5
b  
 
 
r
So, |
| |
|
a
=b
r
r But, the two vectors are not equal since their corresponding components
are distinct