Maharashtra BoardEnglish MediumSTD 9MathsNumber System1 Mark
Question
Examine, whether the following numbers are rational or irrational:$\big(\sqrt{2}-2\big)^2$
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Answer
$\big(\sqrt{2}-2\big)^2$We have, $\big(\sqrt{2}-2\big)^2$
$=2+4-4\sqrt{2}$
$=6+4\sqrt{2}$
6 is a rational number but $4\sqrt{2}$ is an irrational number.
The sum of a rational number and an irrational number is an irrational number, so $\big(\sqrt{2}+\sqrt{4}\big)^2$ is an irrational number.
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