Question

Simplify 9 + 6RADICAL 2 +2 -18 + 3 radical 8

Answer 1

what's RADICAL?

Answer 2

9 + 6sqrt(2) + 2 - 18 + 3sqrt(8)
9 + 6sqrt(2) + 2 - 18 + 3sqrt(4)sqrt(2)
9 + 2 - 18 + 6sqrt(2) + 3(2)sqrt(2)
11 - 18 + 6sqrt(2) + 6sqrt(2)
-7 + 12sqrt(2)
12sqrt(2) - 7

That's about the best I can do for you. Whenever you're given a square root, take that number and see if you can split it up into numbers that can be rooted.
sqrt(8) is either 1*8 or 2*4... 4 is a perfect square. We can factor that out.