Question 146575
{{{3 / (sqrt (x) + 5)}}}
There might be other methods, but the simplest is to multiply thru by the "conjugate", a term that actually has a meaning to do with imaginary numbers.
Multiply thru by {{{5 - sqrt(x)}}}
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{{{(3*(5 - sqrt(x)))/((5 + sqrt(x))*(5 - sqrt(x)))}}}
= {{{(15 - 3sqrt(x))/(25 - x)}}}