I wanted to ask what is the method of simpliflying a quadratic equation without using the formula method. This is probably a easy question but I always get confused and end up using the formula instead, where other people can do it in their head. (like for a non-calculator paper you can't really rely on the formula)
As I learnt the foil method 2 weeks ago from the MHF, a way for expanding brackets which i find very useful.
Lets take an example of: x^2 -8x + 15