quadratic formula

Re:  quadratic formula

Which is

If you mean how to use it, it helps you find the zeros of a quadratic equation in the form $${{\mathtt{ax}}}^{{\mathtt{2}}}{\mathtt{\,\small\textbf+\,}}{\mathtt{bx}}{\mathtt{\,\small\textbf+\,}}{\mathtt{c}} = {\mathtt{0}}$$

This site can help you understand it:

http://www.purplemath.com/modules/quadform.htm

Thanks Kitty,

A great answer - as always.

This will help you remember the formula

https://www.youtube.com/watch?v=O8ezDEk3qCg

It's worth a look!