Question

prove the 6-2√5 is irrational​

Answer 1

$6 - 2 \sqrt{5} = r \\ \\ r = rationl \: \: \: no. \\ \\ but \\ \\ 6 = r \\ \\ \sqrt{5} = not \: \: \: r \\ \\ hence \: addition \: \: \: of \: \: \: r \: \: and \: \: \: not \: \: \: r \: \: \: is \: \: \\ \\ rrartional \\ \\ hence \: \: \: proved$

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