What to do when you are showing your calculations

so, do you go straight to the formula inputting the values where appropriate or do you first write the theoretical formula and explain what each each letter means?

i have been going straight to the numbers with no letter formulas…would this shave points from the answer total ?

thanks for your input

I was unsure about that too, see this thread: https://www.analystforum.com/forums/cfa-forums/cfa-level-iii-forum/91365961