Question 29284
{{{ (sqrt7-sqrt11)(2sqrt7+3sqrt11) }}}


{{{ (sqrt(7)*2sqrt(7)) + (sqrt(7)*3sqrt(11)) - (sqrt(11)*2sqrt(7)) - (sqrt(11)*3sqrt(11)) }}}
{{{ (2sqrt(7)*sqrt(7)) + (3sqrt(7)*sqrt(11)) - (2sqrt(11)*sqrt(7)) - (3sqrt(11)*sqrt(11)) }}}
{{{ 2*7 + 3sqrt(7*11) - 2sqrt(11*7) - 3*11 }}}
{{{ 14 + 3sqrt(77) - 2sqrt(77) - 33 }}}
{{{ -19 + 3sqrt(77) - 2sqrt(77) }}} --> how many {{{sqrt(77)}}}s are there?... there are 3 minus 2 of them...answer is 1 of them:


{{{ -19 + sqrt(77) }}}
or 
{{{ sqrt(77) -19 }}}


jon.