Can anyone explain the 1st question of 3rd section from exercise 1.3

1.	Can anyone explain the 1st question of 3rd section from exercise 1.3
Answer» \xa0(i)\xa0We can prove\xa0irrational by contradiction.Let us suppose that\xa0\xa0is rational.It means we have some co-prime integers\xa0a\xa0and\xa0b\xa0(b\xa0≠ 0) such that=ab⇒\xa0\xa0…\xa0(1)R.H.S\xa0of\xa0(1)\xa0is rational but we know that\xa0\xa0is irrational.It is not possible which means our supposition is wrong.Therefore,\xa0\xa0cannot be rational.Hence, it is irrational.

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