plz help with surds

Answer 1

Here are 3 really good videos, watch them in this sequence

https://www.youtube.com/watch?v=iTt3TVjsjuY
https://www.youtube.com/watch?v=hcsHHWvNZWo
https://www.youtube.com/watch?v=w3PGLLT5nr4

Answer 2

too lazy to even try google, as was suggested earlier?