Example 17 - Chapter 1 Class 9 Number Systems
Last updated at August 14, 2026 by Teachoo
Rationalising
Rationalising denominator of irrational number
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Chapter 1 Class 9 Number Systems
Concept wise
- Rational numbers - Definition
- Finding rational number between two numbers
- Irrational Numbers
- Simplifying real numbers
-
Rationalising
- Laws of exponents
- Finding decimal expansion
- Expressing decimal in p/q
- Classifiying rational/irrational
- Finding irrational numbers b/w two numbers
- Real numbers on a number line
Transcript
Example18 Rationalize the denominator of 1/(2+√3). To rationalize, We multiply and divide by 2 - root 3 Let's check the video 1/(2+√3) = 1/(2+√3) × (2 −√3)/(2−√3) = (2 −√3)/(22−(√3)2) = (2 −√3)/(4−3) = (2 −√3)/1 = 2 -√3 .
