Algebraic Expressions and Identities - Solutions 3

CBSE Class –VIII Mathematics
NCERT Solutions
CHAPTER - 9
Algebraic Expressions and Identities (Ex. 9.3)

1. Carry out the multiplication of the expressions in each of the following pairs:
(i)   (ii)   (iii) 
(iv) 
(v)  
Ans.
(i) 
  = 
(ii) 
(iii)  = 
(iv)  = 
 (v)  = 
= 0 + 0 + 0 = 0

2. Complete the table:

First expression
Second expression
Product
(i)
…..
(ii)
…..
(iii)
…..
(iv)
…..
(v)
…..
Ans.

First expression
Second expression
Product
(i)


(ii)


(iii)


(iv)


(v)




3. Find the product:
(i)  
(ii) 
(iii) 
(iv) 
Ans.
 (i) 
(ii)  
 
(iii)  
(iv)  =

4. (a) Simplify: and find values for
(i)  
(ii) 
(b) Simplify: and find its value for
(i)  
(ii)  
(iii) 
Ans. (a) 
 
(i) For  
= 108 – 45 + 3 = 66
(ii) For  
 
(b) 
 
(i)  For  
 = 0 + 0 + 0 + 5 = 5
(ii) For  
 = 1 + 1 + 1 + 5 = 8
(iii) For  
 =  =4

5. (a) Add:  and 
(b) Add: and 
(c) Subtract: from 
(d) Subtract: from 
Ans.  (a)  
(b)  
  = 
  = 
(c)  
(d)