class9 maths do it please
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answer x=3+2.underoot2
1/x=1/3+2.underoot 2
1/x=1.(3-2.underoot 2)/(3+2.underoot2)(3-2.underoot2) (multiply up and down by (3-2.underoot)
(3+2.underoot2)(3-2.underoot2)=3^2-2.underoot2^2 (a^2-b^2=(a-b)(a+b)
3^2-(2.underoot2)^2=1
1/x=3-2.underoot2/1
x+1/x=3+2.underoot2+3-2underoot2 (2underoot2 gets cancelled)
=3+3
=9
i hope you understand.
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