What is the quadratic formula used for?
The quadratic formula is used to get the roots of a quadratic equation, if the roots exists at all.
We usually just perform factorization to get the roots of a quadratic equation. However, this is not always possible (especially when the roots are irrational)
The quadratic formula is
Using the quadratic formula, let's try to solve the same equation
Performing factorization is a little hard for this equation, so let's jump straight to using the quadratic formula