Mathematics 9 (Complete Solutions)

Q2
Find

If
A =
 
3 0
-1 2
 
,
B =
 
6
5
 
, find.

(i) AB
(ii) BA (If possible)

Solution:

(i) AB
=
 
3 0
-1 2
 
 
6
5
 
=
 
3(6) + 0(5)
-1(6) + 2(5)
 
=
 
18 + 0
-6 + 10
 
=
 
18
4
 
  Answer

(i) BA
=
 
6
5
 
 
3 0
-1 2
 
=
 
6(3) + 5(0)
6(-1) + 5(2)
 
=
 
18 + 0
-6 + 10
 
=
 
18
4
 
  Answer

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