Question 40617
{{{sqrt(20) / 5 - 1 / sqrt(5)}}}
multiply top and bottom of 2nd fraction by {{{sqrt(5)}}}
{{{sqrt(20) / 5 - 1*sqrt(5) / (sqrt(5)*sqrt(5))}}}
{{{sqrt(20) / 5 - sqrt(5) / 5}}}
{{{(sqrt(20) - sqrt(5)) / 5}}}
{{{(2*sqrt(5) - sqrt(5)) / 5}}}
{{{sqrt(5) / 5}}} answer