Question 680711
 simplify. {{{(21+sqrt(18))/3}}}
you can write it
{{{(21)/3}}} + {{{(sqrt(18))/3}}}
Factor inside the radical to reveal a perfect square (9)
{{{(21)/3}}} + {{{(sqrt(9*2))/3}}}
Extract to square root of 9
{{{(21)/3}}} + {{{(3*sqrt(2))/3}}}
Cancel the 3 in both fractions
{{{7 + sqrt(2)}}}