Question

How to prove that an irrational 2root 5

Answer 1

Hey.... I think this can be ur answer!!

Let us assume that 2+root5 is rational

SO,

2+root5 = a/b

Root5 = a/b-2 =a-2b/b

But we know that root5 is irrational

So,

Our assumption was wrong

Therefore, 2+root5 is irrational

Hence proved

Hope it helps you dear ☺️☺️

if it helps you please mark it as brainliest

Answer 2

Let 2root5 be a rational no.

2root5=rational

root5=rational÷2

This contradiction has

arisen due to our incorrect

assumption that 2root5 is

a rational no.