## Summary of Integration Formulas and the Net Change Theorem

### Essential Concepts

• The net change theorem states that when a quantity changes, the final value equals the initial value plus the integral of the rate of change. Net change can be a positive number, a negative number, or zero.
• The area under an even function over a symmetric interval can be calculated by doubling the area over the positive $x$-axis. For an odd function, the integral over a symmetric interval equals zero, because half the area is negative.

## Key Equations

• Net Change Theorem
$F(b)=F(a)+{\int }_{a}^{b}F\text{‘}(x)dx$ or ${\displaystyle\int }_{a}^{b}F\text{‘}(x)dx=F(b)-F(a)$

## Glossary

net change theorem
if we know the rate of change of a quantity, the net change theorem says the future quantity is equal to the initial quantity plus the integral of the rate of change of the quantity