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It's late in the game for me to still be banging my head over this one, so I was hoping for some priceless tips from those who are doing it in their sleep.. PLeeeasse

I know I should remember the Quadratic formula better than I do, but I was encouraged not to resort to it too quickly and so I have pushed myself to pull the roots out of the equation without it except that I struggle with it almost every time.

So here's my questions -

1 Can anyone give me mnemonic or something so I can stop forgetting the QF ?

and

2. Is there a way to recognise off the cuff that I can't get the roots out without it before I try to ?

and

3. Can anyone give me a worked example of doing so with some help on the tricks of the trade because I still struggle and I shouldn't now. I am supposed to have been doing it like my signature for years ?

Thanks in advance.