AP Board Class 8 Maths Chapter 4 Exponents and Powers Ex 4.2 Textbook Solutions PDF: Download Andhra Pradesh Board STD 8th Maths Chapter 4 Exponents and Powers Ex 4.2 Book Answers ~ HSSlive: Plus One & Plus Two Notes & Solutions for Kerala State Board

AP Board Class 8 Maths Chapter 4 Exponents and Powers Ex 4.2 Textbook Solutions PDF: Download Andhra Pradesh Board STD 8th Maths Chapter 4 Exponents and Powers Ex 4.2 Book Answers

AP Board Class 8th Maths Chapter 4 Exponents and Powers Ex 4.2 Textbooks Solutions and answers for students are now available in pdf format. Andhra Pradesh Board Class 8th Maths Chapter 4 Exponents and Powers Ex 4.2 Book answers and solutions are one of the most important study materials for any student. The Andhra Pradesh State Board Class 8th Maths Chapter 4 Exponents and Powers Ex 4.2 books are published by the Andhra Pradesh Board Publishers. These Andhra Pradesh Board Class 8th Maths Chapter 4 Exponents and Powers Ex 4.2 textbooks are prepared by a group of expert faculty members. Students can download these AP Board STD 8th Maths Chapter 4 Exponents and Powers Ex 4.2 book solutions pdf online from this page.

Andhra Pradesh Board Class 8th Maths Chapter 4 Exponents and Powers Ex 4.2 Textbooks Solutions PDF

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Andhra Pradesh State Board Class 8th Maths Chapter 4 Exponents and Powers Ex 4.2 Books Solutions

Board	AP Board
Materials	Textbook Solutions/Guide
Format	DOC/PDF
Class	8th
Subject	Maths
Chapters	Maths Chapter 4 Exponents and Powers Ex 4.2
Provider	Hsslive

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AP Board Class 8th Maths Chapter 4 Exponents and Powers Ex 4.2 Textbooks Solutions with Answer PDF Download

Find below the list of all AP Board Class 8th Maths Chapter 4 Exponents and Powers Ex 4.2 Textbook Solutions for PDF’s for you to download and prepare for the upcoming exams:

Question 1.
Express the following numbers in the standard form.
(i) 0.000000000947
Solution:
= 9471000000000000 = 947 × 10^-12

(ii) 543000000000
Solution:
= 543 × 1000000000 = 543 × 10⁹

(iii) 48300000
Solution:
= 483 × 100000 = 483 × 10⁵

(iv) 0.00009298
Solution:
= 9298100000000
= 9298 × 10^-8

(v) 0.0000529
Solution:
= 52910000000
= 529 × 10^-7

Question 2.
Express the following numbers in the usual form.
(i) 4.37 × 10⁵
Solution:
= 4.37 × 100000
= 437000

(ii) 5.8 × 10⁷
Solution:
= 5.8 × 10000000

(iii) 32.5 × 10^-4
Solution:
= 32.5104=32.510000
= 0.00325

(iv) 3.71529 × 10⁷
Solution:
= 3.71529 × 10000000
= 37152900

(v) 3789 × 10^-5
Solution:
= 3789105=3789100000
= 0.03789

(vi) 24.36 × 10^-3
Solution:
= 24.36103=24.361000
= 0.02436

Question 3.
Express the following information in the standard form
(i) Size of the bacteria is 0.0000004 m
Solution:
= [klatex]\frac{4}{10000000}[/latex] m = 4 x 10^-7 m

(ii) The size of red blood cells is 0.000007mm
Solution:
= 71000000 = 7 × 10^-6

(iii) The speed of light is 300000000 m/sec
Solution:
= 3 × 10,00,00,000 = 3 × 10⁸ m/sec

(iv) The distance between the moon and the earth is 384467000 m(app)
Solution:
= 384467 × 1000 m
= 384467 × 10³

(v) The charge of an electron is 0.0000000000000000016 coulombs
Solution:
= 0.0000000000000000016
= 1610000000000000000000
= 161019
= 16 × 10^-19 coulombs

(vi) Thickness of a piece of paper is 0.0016 cm
Solution:
= 0.0016 cm = 1610000
= 16104
= 16 × 10^-4 cm

(vii) The diameter of a wire on a computer chip is 0.000005 cm
Solution:
= 0.000005 cm = 51000000 cm
= 5106 cm = 5 × 10^-6 cm

Question 4.
In a stack, there are 5 books, each of thickness 20 mm and 5 paper sheets each of thickness 0.016mm. What is the total thickness of the stack.
Solution:
The thickness of 5 books of a pack
= (5 books × their thickness)
= 5(papers × their thickness)
= (20 mm × 5) + (0.016 mm × 5)
= 100 mm + 0.080 mm
= (100 + 0.080) mm
= 100.08 mm
= 1.0008 × 10² mm

Question 5.
Rakesh solved some problems of exponents in the following way. Do you agree with the solutions? If not why? Justify your argument.
(i) x^-3 × x^-2 = x^-6
Solution:
x^-3 × x^-2 = x^-6
= x^-3+(-2) = x^-6 [∵ a^m × aⁿ = a^{m + n} ]
= x^-5 = x^-6
= -5 = -6(False)
∴ In this case do not agree with Rakesh solution.

(ii) 𝑋3𝑋2 = x⁴
Solution:
⇒ x^3-2 = x⁴ [∵ 𝑎𝑚𝑎𝑛 = a^{m – n} ]
⇒ x¹ = x⁴
[∵Here bases are equal, so exponents are also equal]
⇒ 1 = 4 (It is false)
∴ I do not agree with Rakesh solution.

(iii) (x²)³ = (x²)³ = x⁸
Solution:
(x²)³ = 𝑥23 = x⁸
⇒ (x²)³ = 𝑥23
⇒ x^{2 × 3} = 𝑥23
⇒ x⁶ = x^{2 × 2 × 2}
⇒ x⁶ = x⁸
[∵ Bases are equal, so exponents are also equal]
⇒ 6 = 8
It is false
∴ Rakesh solution is wrong.

(iv) x^-2 = √x
Solution:
⇒ x^-2 = x^1/2
⇒ -2 = 1/2 (it is false)
∴ I don’t agree with Rakesh solution.

(v) 3x^-1 = 13𝑥
Solution:
⇒ 3x^-1 = 13𝑥
⇒ 3 × 3 = 𝑥𝑥
⇒ x⁰ = 9
⇒ 1 = 9
It is false
∴ I don’t agree with Rakesh solution

AP Board Textbook Solutions PDF for Class 8th Maths

Andhra Pradesh Board Class 8th Maths Chapter 4 Exponents and Powers Ex 4.2 Textbooks for Exam Preparations

Andhra Pradesh Board Class 8th Maths Chapter 4 Exponents and Powers Ex 4.2 Textbook Solutions can be of great help in your Andhra Pradesh Board Class 8th Maths Chapter 4 Exponents and Powers Ex 4.2 exam preparation. The AP Board STD 8th Maths Chapter 4 Exponents and Powers Ex 4.2 Textbooks study material, used with the English medium textbooks, can help you complete the entire Class 8th Maths Chapter 4 Exponents and Powers Ex 4.2 Books State Board syllabus with maximum efficiency.

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