Rationalise the denominator of `1/(3+sqrt(2))`

Explanation

Given :
`1/(3+sqrt(2))`
Multiplying the numerator and denominator of the given number by `(3-sqrt(2))`
i.e,
`1/(3+sqrt(2))=1/(3+sqrt(2))xx(3-sqrt(2))/(3-sqrt(2))`
`=(3-sqrt(2))/(3^2-(sqrt2)^2)`
`=(3-sqrt(2))/(9-2)`
`=(3-sqrt(2))/7`