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Find whether the variable y represents a rational or an irrational number: y2 = 9 - Mathematics

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Question

Find whether the variable y represents a rational or an irrational number:

y2 = 9

Sum
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Solution

y2 = 9

On solving, we get

⇒ y = ± 3

Hence, y is a rational number.

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Chapter 1: Number Systems - Exercise 1.3 [Page 9]

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NCERT Exemplar Mathematics [English] Class 9
Chapter 1 Number Systems
Exercise 1.3 | Q 1. (ii) | Page 9
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