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  1. If x = 5 + 2√6, then the value of x +
    1
    is,
    x
    1. 2√2
    2. 3√2
    3. 2√3
    4. 3√3
Correct Option: C

x = 5 + 2√6

∴ 
1
=
1
=
5 − 2√6
x5 + 2√6(5 + 2√6)(5 − 2√6)

=
5 − 2√6
= 5 − 2√6
25 − 24

∴  x +
1
2 = x +
1
+ 2
xx

= 5 + 2√6 + 5 – 2√6 + 2 = 12
∴  x +
1
= √12 = 2√3
x



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