Question

2-root 5 is .............. ( Rational / irrational )​

Answer 1

Answer:

Step-by-step explanation:

Let 2√5 be rational number.

2√5 = a / b , where a and b are co-prime and (b≠0)

√5 = a / 2b

Since, a / 2b is rational so, √5 is also rational.

But this contradicts the fact that √5 is irrational.

Therefore, our incorrect consumption is wrong.

So, we conclude that 2√5 is an irrational number.

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Answer 2

Answer:

irrational

Step-by-step explanation:

rational no. - irrational no. = irrational no.