Question

2-√5 is a irrational number​

Answer 1

2-√5= a/b    a and b are co primes'

-√5= a/b -2

multiply - on both sides

√5= 2-a/b

√5= 2b-a/b

√5= irrational

2b-a/b = rational

but

irrational is not equal rational

hence its irrational

Answer 2

Step-by-step explanation:

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