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Can anyone explain the 1st question …

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

    • Posted by Mariya S.? 5 years, 3 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Gaurav Seth 5 years, 3 months ago

     (i) We can prove irrational by contradiction.

    Let us suppose that  is rational.

    It means we have some co-prime integers a and b (b ≠ 0) such that

    =ab

    ⇒  … (1)

    R.H.S of (1) is rational but we know that  is irrational.

    It is not possible which means our supposition is wrong.

    Therefore,  cannot be rational.

    Hence, it is irrational.

    1Thank You

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