Question 68176
Simplify:
{{{sqrt(20)/5-1/sqrt(5)}}}
The LCD is {{{5*sqrt(5)}}}
{{{sqrt(20)*sqrt(5)/(5*sqrt(5))-1*5/(5*sqrt(5))}}}
{{{sqrt(100)/(5sqrt(5))-5/(5sqrt(5))}}}
{{{10/(5sqrt(5))-5/(5sqrt(5))}}}
{{{(10-5)/(5sqrt(5))}}}
{{{5/(5sqrt(5))}}}
{{{cross(5)/(cross(5)sqrt(5))}}}
{{{1/sqrt(5)}}}  Most books want you to also rationalize the denominator.
{{{1*sqrt(5)/(sqrt(5)*sqrt(5))}}}
{{{sqrt(5)/sqrt(25)}}}
{{{highlight(sqrt(5)/5)}}}
Happy Calculating!!!