Question 237897
why change the numbers. Just post your real questions
{{{(2*sqrt(2) - 6*sqrt(7))*(3sqrt(2) + 9sqrt(7))}}} just multiply like your would with integers
{{{2sqrt(2)*3sqrt(2) + 2sqrt(2)*9sqrt(7) - 6*sqrt(7)*3sqrt(2) - 6sqrt(7)*9sqrt(7)}}}
{{{6*2 + 18sqrt(2)sqrt(7) - 18sqrt(7)sqrt(2) - 54*7}}}
{{{12 + 18sqrt(14) - 18sqrt(14) - 378}}}
{{{12 - 378}}}
{{{-366}}}

{{{ (49 /(11z-77)) / (77z/(z-7))}}} 

{{{ (49 /(11z-77)) * ((z-7)/77z)}}} 

{{{ (49 /(11*(z-7))) * ((z-7)/77z)}}} 
{{{(49/11)*(1/77z)}}}
{{{(7/11)*(1/11z)}}}
{{{7/121z}}}