Where did all these formulas come from anyway?
All forms of math and science (including cooking, shopping, etc) are loaded with formulas. Formulas are nothing but a relationship between two different things.
The quadratic formula is one of the most well-known formulas in math – and one you will use again and again.
It is often interesting to see how formulas are derived. After all, it is very likely that you have, or will, have your own formulas you create for your hobbies or work.
Here is a great step-by-step explanation of how the quadratic formula is derived.