Have you tried using factors of 18 under the square root sign?
okay, i seem to be pretty cool with the basics of rationalizing surds, just started doing a level maths, is going okay.
three questions, though, i keep trying to do and can't see where i'm going wrong, here they are.
don't know how to do the symbols so will just write it
********
square root of 6,
over
square root of six, plus square root of 3
i get 6 minus square root of 18,
over,
3
however, the book says ....
2 minus square root of 2,....
i really can't see how they got this, hopefully if its explained, i'll be able to do the other two.
thanks!