Mathematics 9 (Complete Solutions)

Q3
Find the following products.

(i)  
 
1 2
 
 
4
0
 
(ii)  
 
1 2
 
 
5
-4
 
(iii)  
 
-3 0
 
 
4
0
 
(iv)  
 
6 0
 
 
4
0
 
(v)  
 
1 2
-3 0
6 -1
 
 
4 5
0 -4
 


Solution:

(i)  
 
1 2
 
 
4
0
 
=
 
1(4) + 2(0)
 
=
 
4 + 0
 
=
 
4
 
  Answer

(ii)  
 
1 2
 
 
5
-4
 
=
 
1(5) + 2(-4)
 
=
 
5 - 8
 
=
 
-3
 
  Answer

(iii)  
 
-3 0
 
 
4
0
 
=
 
-3(4) + 0(0)
 
=
 
-12 + 0
 
=
 
-12
 
  Answer

(iv)  
 
6 0
 
 
4
0
 
=
 
6(4) + 0(0)
 
=
 
24 + 0
 
=
 
24
 
  Answer

(v)  
 
1 2
-3 0
6 -1
 
 
4 5
0 -4
 
=
 
1(4) + 2(0) 1(5) + 2(-4)
-3(4) + 0(0) -3(5) + 0(-4)
6(4) + (-1)(0) 6(5) + (-1)(-4)
 
=
 
4 + 0 5 - 8
-12 + 0 -15 + 0
24 + 0 30 + 4
 
=
 
4 -3
-12 -15
24 34
 
  Answer

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