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    If x=12+1x=\frac{1}{\sqrt2+1}x=2​+11​​, then what will be the value of x+1x+1x+1​?
    Question

    If x=12+1x=\frac{1}{\sqrt2+1}​, then what will be the value of x+1x+1​?

    A.

    2\sqrt2​​

    B.

    2

    C.

    2+1\sqrt2+1​​

    D.

    21\sqrt2-1​​

    Correct option is A

    Given:

    x = 12+1\frac{1}{\sqrt{2} + 1}
    Solution:

    x=12+1×2121=21(2+1)(21)=2121=21x = \frac{1}{\sqrt{2} + 1} \times \frac{\sqrt{2} - 1}{\sqrt{2} - 1} = \frac{\sqrt{2} - 1}{(\sqrt{2} + 1)(\sqrt{2} - 1)} = \frac{\sqrt{2} - 1}{2 - 1} = \sqrt{2} - 1​​

    x+1=21+1=2x + 1 = \sqrt{2} - 1 + 1 = \sqrt{2}

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