Hi, I basically need some help with Surds and understand them and also general algebra. Basically the first question of mine is what is about simplifying:

(Ill replace Square Root icon with a '*' as I cant find the icon anywhere to copy and paste)

1. *1 + *2 + *4 + *8

I originally thought that it would be just adding the numbers together to get *15 but then realised that isnt possible. Could someone please explain what exactly I have to do, not just give me the answer so I know how to do it in the future.

Also what would x(squared)+x-2 be? I know it would start as:

(x+ )(x- ) but dont know what goes in the gaps?

Thanks a lot.