Question 1115092
{{{4/(1+sqrt(5))}}} Multiply both sides by {{{1-sqrt(5)}}} to create a <U>difference of squares</U>* and you get

{{{(1-sqrt(5))/-4}}}

{{{(sqrt(5)-1)/4}}}

*Note: The difference of squares says that (a+b)(a-b)=a<SUP>2</SUP>-b<SUP>2</SUP>.