Hey everyone, I'm new on this forum and I apologize in advance if I'm posting on the wrong sub-forum .

I'm trying to rearrange: √18/(√6+√3) to √6(√2-1).

So I got √18/[√3(√2+1)] which I cancelled down to √6/(√2+1) and then rearranged to √6(√2+1)^-1. Can anyone please tell me what the next step is? Or have I made a mistake already? Thanks.