Question

classy the following is rational or rational. 2-√5​

Answer 1

It's irrational

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Answer 2

Answer:

The following is irrational.

Step-by-step explanation:

Assume 2-$\sqrt{5}$ is rational

then there exist two co prime numbers that are:-

2-$\sqrt{5}$ = a/b

-$\sqrt{5}$ = a/b - 2

a,b,2 are all rational therefore root5 is rational too, but that opposes the fact that root5 is irrational thus 2-$\sqrt{5}$ is irrational