Last updated at June 29, 2018 by Teachoo

Transcript

Ex1.5, 5 Rationalize the denominators of the following: (i) 1/√7 We need to rationalize i.e. remove root from denominator Hence multiplying and dividing by √7 1/√7 = 1/√7 ×√7/√7 = √7/(√7)2 = √7/7 Ex1.5, 5 Rationalize the denominators of the following: (ii) 1/(√7 −√6) 1/(√7 −√6) = 1/(√7 − √6) × (√7 + √6)/(√7 + √6) = (√7 + √6)/((√7)2 − (√6)2) = (√7 + √6)/(7 − 6) = (√7 + √6)/1 = √7+√6 Ex1.5, 5 Rationalize the denominators of the following: (iii) 1/(√5 −√2) 1/(√5 − √2) = 1/(√5 − √2) × (√5 + √2)/(√5 + √2) = (√5 + √2)/((√5)2 − (√2)2) = (√5 + √2)/(5 − 2) = (√5 + √2)/3 Ex1.5, 5 Rationalize the denominators of the following: (iv) 1/(√7 − √2) 1/(√7 − √2) = 1/(√7 −√2) × (√7 + √2)/(√7 + √2) = (√7 + √2)/((√7)2 − (√2)2) = (√7 + √2)/(7 − 2) = (√7 + √2)/5

Chapter 1 Class 9 Number Systems

Ex 1.1,3
Important

Ex 1.1,4 Important

Ex 1.2,1 Important

Ex 1.2,3 Important

Example 7 Important

Example 9 Important

Example 10 Important

Ex 1.3,3 Important

Ex 1.3,8 Important

Ex 1.3,9 Important

Example 16 Important

Example 19 Important

Ex 1.5,1 Important

Ex 1.5,2 Important

Ex 1.5,4 Important

Ex 1.5,5 Important You are here

Example 21 Important

Ex 1.6,1

Ex 1.6,2 Important

Ex 1.6,3 Important

Class 9

Important Questions for Exam - Class 9

- Chapter 1 Class 9 Number Systems
- Chapter 2 Class 9 Polynomials
- Chapter 3 Class 9 Coordinate Geometry
- Chapter 4 Class 9 Linear Equations in Two Variables
- Chapter 5 Class 9 Introduction to Euclid's Geometry
- Chapter 6 Class 9 Lines and Angles
- Chapter 7 Class 9 Triangles
- Chapter 8 Class 9 Quadrilaterals
- Chapter 9 Class 9 Areas of parallelograms and Triangles
- Chapter 10 Class 9 Circles
- Chapter 11 Class 9 Constructions
- Chapter 12 Class 9 Herons Formula
- Chapter 13 Class 9 Surface Areas and Volumes
- Chapter 14 Class 9 Statistics
- Chapter 15 Class 9 Probability

About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.