Surds help

1. What did you think of the help provided to your previous surds question? Did you complete it in the end? Is there anything you can learn from it?

2. Your question seems to be missing the surds.

3. Where is your attempt at this question? It is fine to be completely stumped but to say nothing at all with no working is not.

Er... not sure what that thing is supposed to mean... please make it clearer!

/ = the surd sign because I don't know how to it and the 2 means squared.

OK, so the first thing I'd do is notice that $\sqrt{12}$ can be simplified to something in the form $a\sqrt{3}$

Then expand the square and you should end up with 12 root 3 in the expression.

Would 12 root 3 be simplified into 4/3

Yes

How is the 21- 12/3? That's what I don't know, I understand why we get 21 but not 12 root 3...