# How do you simplify #sqrt205#?

##### 1 Answer

May 19, 2018

#### Explanation:

Note that:

#205 = 5 * 41#

has no square factors larger than

Using the algorithm described in https://socratic.org/s/aR4mTUXq we can find that the continued fraction expansion for

#sqrt(205) = [14;bar(3,6,1,4,1,6,3,28)]#

#color(white)(sqrt(205)) = 14+1/(3+1/(6+1/(1+1/(4+1/(1+1/(6+1/(3+1/(28+...))))))))#

From this we can find the smallest solution of Pell's equation for

#39689^2 = 205 * 2772^2 + 1#

and related efficient rational approximation:

#sqrt(205) ~~ 39689/2772 ~~ 14.31782107#