Exercise 1.2 (NCERT) – Real Numbers, Class 10 – All Solutions

30 Apr
Class 10, Class 10 - Chapter 1, Class 10 - Real Numbers, , , ,

Exercise 1.2 (NCERT) - Real Numbers, Class 10

Chapter 1 Exercise 1.2 Class 10

Below are the Quick links for all questions of Exercise 1.2, Real Numbers, Class 10.

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Below are the solutions of every question of exercise 1.2 of chapter 1, Real Numbers, NCERT of class 10. YouTube video tutorial of every question is also embedded along with the written solution.  

 

Question 1

Prove that √5 is irrational.

We prove such questions by contradiction.

Let us assume that \( \begin{aligned} \sqrt{5}\end{aligned}\) is a rational number.

This is a contradiction, becasue

Hence our assumption is wrong.

This implies √5 is irrational.

Question 2

Prove that 3 +2 √5 is irrational.

Question 3

Prove that the following are irrationals :

(i) 1/√2

(ii) 7 √5

(iii) 6 + √2