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
Answer:

4 x 7 p = 28p
- 4p x 7p = -28p²
- 4p x 7pq = -28p²q
4p³ x - 3p = -12p⁴
4p x 0 = 0

Question 2
Find the areas of rectangles with the following pairs of monomials as their lengths and breadths respectively.

(p, q)
(10m, 5n)
(20x² 5y²)
(4x, 3x²)\
(3mn, 4np)

Answer: Now we know that
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:
NCERT Solutions for Algebraic Expressions and Identities Class 8 Maths Chapter 9

NCERT Solutions for Algebraic Expressions and Identities Class 8 Maths Chapter 9

Answer
Ncert Solutions for Algebraic Expressions and Identities Class 8 maths

Question 4
Obtain the volume of rectangular boxes with the following length, breadth and height respectively.

5a, 3a², 7a⁸
(2p, 4q, 8r)
xy, 2x²y, 2xy²
(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

xy, yz, zx
a, – a² a³
2, 4y, 8y² 16y³
a, 2b, 3c, 6abc
m, – mn, mnp

Answer:
(i) x²y²z²
(ii) –a⁵
(iii) 1024y⁶
(iv) 36a²b²c²
(v) –m³n²p

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Also Read

Class 8 Maths Class 8 Science

Reference Books for class 8 Math

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

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

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