Subtract. Simplify by collecting like radical terms if possible.

Question

3sqrt18-3sqrt2 =6sqrt2
I did help.

Answer 1

correct

when reducing radicals, look for factors of the inside number which are perfect squares.
e.g. 18 = 9*2
so √18 = √9*√2 = 3√2
splitting 18 into 6*3 would be of no use.

Another thing to look for :
radicals of small numbers, as in your case √2
Often you will be able to reduce your larger radicals to exactly that smaller one.

Answer 2

thanks