Question 447670
the square root of 72 - the square root of 18
{{{sqrt(72) - sqrt(18)}}}
{{{sqrt(3*3*2*2*2) - sqrt(3*3*2)}}}
{{{3*2*sqrt(2) - 3*sqrt(2)}}}
{{{6*sqrt(2) - 3*sqrt(2)}}}
{{{3*sqrt(2)}}}