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.