Algebraic Expressions and Identities - Solutions 2
CBSE Class –VIII Mathematics
NCERT Solutions
CHAPTER - 9
Algebraic Expressions and Identities (Ex. 9.2)
NCERT Solutions
CHAPTER - 9
Algebraic Expressions and Identities (Ex. 9.2)
1. Find the product of the following pairs of monomials:
(i) 
(ii) 
(iii) 
(iv) 
(iv) 
Ans.
(i) 
= 
= 
= =
(ii) 
= 
=
= 
(iii) 
= 
=
= 
(iv) 
=
=
= 
(v) 
= 
= 0
= = 0
2. Find the areas of rectangles with the following pairs of monomials as their lengths and breadths respectively:
Ans.
(i) Area of rectangle
= 
= 
sq. units
sq. units
(ii) Area of rectangle
=
= 
= 
sq. units
sq. units
(iii) Area of rectangle =
= 
= 
sq. units
sq. units
(iv) Area of rectangle =
= 
= 
sq. units
sq. units
(v) Area of rectangle =
= 
= 
sq. units
sq. units
3. Complete the table of products:
(i)
Ans.
(i)
Ans.
(i)
4. Obtain the volume of rectangular boxes with the following length, breadth and height respectively:
(i) 
(ii) 
(iii) 
(iv) 
Ans. (i) Volume of rectangular box
= 
= 
cubic units
cubic units
(ii) Volume of rectangular box
= 
= 
cubic units
cubic units
(iii) Volume of rectangular box
= 
= 
cubic units
cubic units
(iv) Volume of rectangular box
=
= 
cubic units
5. Obtain the product of:
(i) 
(ii) 
(iii) 
(iv) 
(v) 
Ans.
(i) 
= 
(ii) 
= 
=
= 
(iii) 
= 
(iv) 
=
(v) 
=(-1)(mxmxmxnxnxp)
=(-1)(mxmxmxnxnxp)
= 
