Question

Prove that 2root 5 is irrational

Answer 1

√5 is a irrational number than irrational number × something = irrational number

hence it proved

Answer 2

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Let , 2√5 is an rational number

2 √5 = A / B

√5 = A / 2 × B

So , our Assumption is wrong 2√5 is an irrational number

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