Question 761881
{{{sqrt(5)/(4sqrt(5) + 2)}}}
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You didn't say what you want to do.
You can get the radicals out of the denominator, that's a popular thing.
Multiply NUM & DEN by the conjugate of the DEN, 4sqrt(5) - 2
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{{{sqrt(5)/(4sqrt(5) + 2) = sqrt(5)*(4sqrt(5)-2)/((4sqrt(5) + 2)*(4sqrt(5) - 2))}}}
= {{{(4*5 - 2sqrt(5))/(80 - 4)}}}
= {{{(20 - 2sqrt(5))/76}}}
= {{{(10 - sqrt(5))/38}}}