Question

prove that 1 minus 2 root 5 is irrational​

Answer 1

Answer:

Step-by-step explanation:

Let us assume that1-5√2 is a rational number and can be written in the form a/b where a,b are coprime

1-5√2=a/b

√2=a-5b/b

But this contradict the fact that√2 rational

So, our assumption is wrong that1-5√2 is rational

So,1-5√2 is irrational

Hence proved