Question

class9 maths do it please​

Answer 1

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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