Question 917676
{{{7 sqrt(12) + 8 sqrt(147) - 15 sqrt(27)}}}

Show it this way:

7*sqrt(12)+8*sqrt(147)-15sqrt(27)

Not known why the rendering did not work right for you...
{{{7*sqrt(12)+8*sqrt(147)-15sqrt(27)}}}


The radicals contains a few 3's factors.
{{{7*sqrt(2*2*3)+8*sqrt(3*7*7)-15*sqrt(3*3*3)}}}
{{{7*2*sqrt(3)+8*7*sqrt(3)-15*3*sqrt(3)}}}
{{{14*sqrt(3)+56*sqrt(3)-45*sqrt(3)}}}


How is that now for you?  You know how to finish?


(You understood as terms of square root of three:  {{{25*sqrt(3)}}} .)