Question 257216
The original problem was
{{{sqrt(r)/(3-sqrt(r))}}}
step 1 - rationalize the denominator to get
{{{sqrt(r)*(3+sqrt(r))}}} / {{{((3-sqrt(r))*(3+sqrt(r)))}}}
step 2 - distribute top and bottom to get
{{{(3sqrt(r)+r)}}} / {{{9-r}}}
This is your answer