Simplify square root 363 -3 square root 27

Square root 363 - 3 square root 27 can be simplified as follows:

Square root 363 = square root(121*3) = 11 square root 3
Square root 27 = square root(9*3) = 3 square root 3

Therefore, the expression simplifies to:

11 square root 3 - 3 square root 3 = 8 square root 3