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The square of an irrational number is always rational. - Mathematics

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Question

The square of an irrational number is always rational.

Options

  • True

  • False

MCQ
True or False

Solution

This statement is False.

Explanation:

Let us consider irrational numbers `sqrt(2)` and `root(4)(2)`

  1. `(sqrt(2))^2 = 2`, which is a rational number.
  2. `(root(4)(2))^2 = sqrt(2)`, which is an irrational number.

Hence, square of an irrational number is not always a rational number.

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Chapter 1: Number Systems - Exercise 1.2 [Page 6]

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NCERT Exemplar Mathematics [English] Class 9
Chapter 1 Number Systems
Exercise 1.2 | Q 3. (v) | Page 6

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