Question

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prove that _/2 is irrational

Answer 1

Hope this helps you.

Answer 2

if we substitute a=2k this in to original equation 2=a^2/b^2 this is get

2=(2k)^2/b^2

2=4k^2/b^2

2*b^2=4k^2

b^2=2k

it means that b^2 is even

so it is irrational

I hope it's help you