I agree with that. But if it doesn't say that. If the solution to the polynomial is just a step in the solution to a bigger problem. What then?

In an Alevel exam, will students who use their calculator to solve a polynomial get full marks if they don't show any working out? #alevelmaths

I always use 2n-1 as odd because it includes the number "1" which 2n+1 doesn't.

Yes please