Examine whether the following numbers are rational or irrational:$ \sqrt{5}-2 $

Given:

\( \sqrt{5}-2 \)

To do:

We have to classify the given number as rational or irrational.

Solution:  

A rational number can be expressed in either terminating decimal or non-terminating recurring decimals and an irrational number is expressed in non-terminating non-recurring decimals.

Therefore,

$\sqrt{5}=2.23606............$

The decimal expansion of \( \sqrt{5} \) is non-terminating and non-recurring.

The sum(difference) of a rational number and an irrational number is an irrational number.

Therefore, \( \sqrt{5}-2 \) is an irrational number.  

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Updated on: 10-Oct-2022

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