I have been seeing a few during in my practice questions which leaves me worrying. If it is a quadratic function, the irrational numbers can be easily obtained using the equation. However, I got a question today which eventually took this form: 28D3+36D2-41D2+4 = 0 (I reevaluated everything a few times and I think it is correct) And it reminded me of various other instances where this also happened. I punched the numbers into my calculator (still using a Casio fx-570MS) but all hell broke loose when all three roots are irrational. So, I would like to ask if there is any way to convert an irrational root into a number in terms of its squareroot? Lecturer assured there shouldn't be many of this kind of questions around, but at least it is good to be informed. The easier way is to get a more up to date calculator. I recall there was one or two capable of converting to squareroots.