I am having difficulty solving these surds problems
If you have two binomials like , they are expanded by multiplying the Firsts, then the Outers, then the Inners, then the Lasts.
So for your first one, you have
Multiplying the firsts gives .
Multiplying the outers gives
Multiplying the inners gives
Multiplying the lasts gives .
For the second, you need to simplify all of the surds first. Then hopefully you'll have "like surds" that can be collected.
Chookas for the exam tomorrow.