SOLUTION: Subtract then simplify (2 square root 18) - (4 square root 2) Any help please?

Question 156518: Subtract then simplify
(2 square root 18) - (4 square root 2)
Any help please?
Answer by checkley77(12844) (Show Source): You can put this solution on YOUR website!
(2 square root 18) - (4 square root 2)
2sqrt(9*2)-4sqrt(2)
2*3sqrt(2)-4sqrt(2)
6sqrt(2)-4sqrt(2)
2sqrt(2) answer.