Question 92020
{{{(4sqrt(72)-sqrt(18))}}}
{{{(4sqrt(3*3*4*2)-sqrt(2*3*3))}}}  [Factor the radicands if possible]
{{{(4*3*2sqrt(2)-3sqrt(2))}}}  [Find the square root wherever possible]
{{{(24sqrt(2)-3sqrt(2))}}}  [Simplify]
{{{(21sqrt(2))}}}   [Combine like-terms]