Question 76793
The given expression is: 


{{{sqrt(3)(6sqrt(7)-2sqrt(3))}}} 


We fisrt simplify the brackets, that is 


{{{ (sqrt(3) * sqrt(7) * 6) - (2 * sqrt(3) * sqrt(3)) }}} 


This implies, 


{{{ sqrt(21) * 6 - 2 * (3) }}} 


{{{ 6 * sqrt(21) - 6 }}} 


Taking out 6 as the common factor, we get: 


6 {{{(sqrt(21) - 1)}}}


Hence, the solution.