chapter-header

RS Aggarwal Solutions Class 8 Mathematics Solutions for Cubes and Cube Roots Exercise 4D in Chapter 4 - Cubes and Cube Roots

Question 7 Cubes and Cube Roots Exercise 4D

\sqrt[3]{(125\times64)=?}

a) 100

b) 40

c) 20

d) 30

Answer:

Firstly we have to find the prime factors of 125

125 = 5 × 5 × 5

And the prime factors of 64

64 = 2 × 2 × 2 × 2 × 2 × 2

\sqrt[3]{(125\times64)}=\sqrt[3]{(5\times5\times5\times4\times4\times4)}=\sqrt[3]{(5\times5\times5)\times\sqrt[3]{(4\times4\times4)}}

= 5 × 4 = 20

∴ 20 is the correct answer.

Connect with us on social media!
2022 © Quality Tutorials Pvt Ltd All rights reserved