Handy Formulas
The Quadratic Formula
Given a quadratic equation in standard form:
The quadratic formula is:
The Compound Interest Formula
The compound interest formula is:
where
- A is the total amount of money after interest is earned
- P is the amount of money originally invested (the principal)
- R is the annual rate of interest (APR)
- t is the number of years
- n is the number of times per year the interest is compounded