 # Ncert Solutions for Algebraic Expressions and Identities Class 8 Maths Chapter 9 Exercise 9.2

In this page we have NCERT Solutions for Algebraic Expressions and Identities Class 8 Maths Chapter 9 for Exercise 9.2 . Hope you like them and do not forget to like , social share and comment at the end of the page.
Question 1
Find the product of the following pairs of monomials.
(i) 4, 7p
(ii) – 4p, 7p
(iii) – 4p, 7pq
(iv)  4p3, – 3p
(v) 4p, 0
1. 4 x 7 p = 28p
2. - 4p x 7p = -28p2
3.  - 4p x 7pq = -28p2q
4. 4p3 x - 3p = -12p4
5. 4p x 0 = 0
Question 2
Find the areas of rectangles with the following pairs of monomials as their lengths and breadths respectively.
1. (p, q)
2. (10m, 5n)
3. (20x2 5y2)
4. (4x, 3x2)\
5. (3mn, 4np)
Area of rectangle = Length x breadth
So it is multiplication of monomials
(i) p x q = pq
(ii)10m x  5n = 50mn
(iii) 20x2 x  5y2 =  100x2y2
(iv) 4x x 3x2 = 12x3
(v)3mn x  4np = 12mn2p
Question 3.
Complete the following table of products:  Question 4
Obtain the volume of rectangular boxes with the following length, breadth and height respectively.
1. 5a, 3a2, 7a8
2.  (2p, 4q, 8r)
3. xy, 2x2y, 2xy2
4. (a, 2b, 3c
Answer: We know that volume of rectangular box is given by Volume = length x  breadth x  height
(i) 5a x 3a2 x 7a8 = 105a11
(ii) 2p x 4q x 8r = 64pqr
(iii) xy x 2x2y x 2xy2 = 4x4y4
(iv) a x  2b x 3c = 6abc
Question 5
Obtain the product of
1. xy,  yz, zx
2. a, – a2 a3
3. 2, 4y, 8y2 16y3
4. a, 2b, 3c, 6abc
5. m, – mn, mnp
(i) x2y2z2
(ii) –a5
(iii) 1024y6
(iv) 36a2b2c2
(v) –m3n2p

Reference Books for class 8 Math

Given below are the links of some of the reference books for class 8 Math.

1. Mathematics Foundation Course for JEE/Olympiad : Class 8 This book can take students maths skills further. Only buy if child is interested in Olympiad/JEE foundation courses.
2. Mathematics for Class 8 by R S Aggarwal Detailed Mathematics book to clear basics and concepts. I would say it is a must have book for class 8 student.
3. Pearson Foundation Series (IIT -JEE / NEET) Physics, Chemistry, Maths & Biology for Class 8 (Main Books) | PCMB Combo : These set of books could help your child if he aims to get extra knowledge of science and maths. These would be helpful if child wants to prepare for competitive exams like JEE/NEET. Only buy if you can provide help to the child while studying.
4. Reasoning Olympiad Workbook - Class 8 :- Reasoning helps sharpen the mind of child. I would recommend students practicing reasoning even though they are not appearing for Olympiad.

You can use above books for extra knowledge and practicing different questions.

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