over too ey ?

I know I’ve asked about memorising formulas before, but I came across my notes from Diag Drill #3 and found a parabola question where I used x=-b/2a. Am I mistaken here ? Whats the pwn stance one this formula.

You don’t *need* to memorize that formula, but it sounds like you already know it. If you already know it, and you see an opportunity to use it, of course that’s fine. I guess a good exercise for you, though, would be to try to figure out how you might be able to solve that same question *without* that formula.