Surds & Rationalisation Theory | Class 9 ICSE & CBSE Maths | Chapter 1

In this session, we break down what makes a root a surd, core radical laws, conjugate pairs, and step-by-step methods to rationalise denominators. 📘 What You Will Learn in This Video: Definition of a Surd: Why x must be a positive rational number and \sqrt[n]{x} must be irrational. Surd vs. Irrational: Why every surd is irrational, but numbers like \pi are not surds. Radical Laws: Multiplying, dividing, and raising surds to powers under the same index. Simplest Radical Form: Factoring out perfect squares before performing addition or subtraction. Conjugates: Using conjugates to eliminate radicals from binomial expressions. Standard Convention: Eliminating roots from denominators to express answers in proper mathematical form. #Class9Maths #ICSEClass9 #CBSEClass9 #Surds #Rationalisation #IrrationalNumbers #MathsTutorial