1. ## Algebra/ surds

Help.

2. You messed up in the second line

$\frac3{\sqrt x}+\sqrt x=\frac3{\sqrt x}+\frac x{\sqrt x}=\frac{3+x}{\sqrt x}$

3. ...........

4. Yeah, that's right!

It's just that expressin' $a=\frac a1$ is quite trivial, but it doesn't matter