Algebraic Expressions and Identities - Solutions 3
CBSE Class –VIII Mathematics
NCERT Solutions
CHAPTER - 9
Algebraic Expressions and Identities (Ex. 9.3)
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) 
(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
and find values for
(i) 
(ii) 
(b) Simplify:
and find its value for
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
= =4
5. (a) Add: 
and 
and
(b) Add:
and 
and
(c) Subtract:
from 
from
(d) Subtract:
from 
from
Ans. (a) 
= 
= 
(b) 
= 
= 
= 
(c) 
= 
= 
= 
(d) 
= 
= 
= 
= 
= 
= 
