Math, asked by maheshbhujel1971, 1 month ago

plz help
this is for exam plz

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Answered by subhashattri07

1

$= (5 - \sqrt{2} )(5 + \sqrt{2} ) \\ = 25 + 5 \sqrt{2} - 5 \sqrt{2} - 4 \\ = 21 \\ so \: \: 21 \: is \: \: a \: \: rational \: \: number$

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