Question 1124178
I suspect the question is  'what is {{{ 2/(3-sqrt(5)) }}} ?'

If so,  {{{ 2/(3-sqrt(5)) }}} <br>
= {{{ (2*(3+sqrt(5))) / ((3-sqrt(5))*(3+sqrt(5))) }}}<br>
= {{{ (6+2sqrt(5)) / (9-5) }}}<br>
= {{{ highlight( (3+sqrt(5)) / 2) }}}   (approximately 2.618034) <br>

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If the question is really 'what is  {{{ 2/3 - sqrt(5) }}}?'  — as the question is written — then there is no simplification, and the value is approximately -1.569401.   Be sure to use parenthesis.