What is 3sqrt(3)-sqrt(45) plus 3sqrt(13)?

3sqrt(3) - sqrt(45) + 3sqrt(13)= 3sqrt(3) - 3sqrt(5) + 3sqrt(13) = 3*[sqrt(3) - sqrt(5) + sqrt(13)] where the expression in parenthesis cannot be simplified.

The value is 9.3046, approx.