Hi all.

I'm having trouble trying to solve this problem without a calculator.

The first part of the question is to solve , giving your answer in terms of surds. I solved this and got and .

For the next part of the question, I need to solve , giving the answer correct to 2 d.p.

By letting , I can get that and , and from there that and , but I really don't see how I could work out the values without a calculator. Any ideas?

Thanks in advance.