6 sqr90 - sqr7 + 9 sqr36. I'm sorry if I wrote it wrong I only know how to put the radical symbol, Thanks for your help.
Start by simplifying the contents of the square roots:
6*sqrt(9*10) - sqrt(7) + 9*6
18*sqrt(10) - sqrt(7) + 54
6*sqrt(9*10) - sqrt(7) + 9*6
18*sqrt(10) - sqrt(7) + 54