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Improving your grades on your ib mathematics exams

Say you are doing an IB maths paper and you are on a question that will reward you 5 marks for a worked answer. There is the easy way of doing it with your calculator or the hard way of working it out yourself (which you suspect is the way they want you to work it out), you can only remember the way to do it on the calculator so do you:
a) Write down some of the sums you used or
b) write down everything you pressed on the calculator in the hope you will get some of the marks?
- Holly

 
IB help in Mathematics SL for finding coefficients in expansions

IB Math SL Paper 2:
In the expansion of (2-ax)^5 the coefficient of x^2 is 5. Find the value of a.
I tried is using the formula for finding any specific term but I didn't get far.
- Kimberly

This questions has a Video Answer