The Definite Integral

Remember the difference between the indefinite integral and the definite integral:
Indefinite

• will have a "+ C"
• answer will be a function
• no upper/lower bound on integral symbol

Definite

• no "+ C"
• answer will be a NUMBER
• it has upper/lower bounds on integral symbol

Steps to solving:

1. Find the integral

2. Plug in upper bound

3. Plug in lower bound

4. Subtract step #3 from step #2

Website with worked examples and good explanations!

Remember what we are REALLY doing...calculating definite integrals is the "easy" way to add up all those infinite rectangles and get the TRUE area under a curve.