AP® Calculus AB · Unit 6 · Topic 6.4

The Fundamental Theorem of Calculus and Accumulation Functions

Watch it explained

  1. How it worksHow does sliding the upper limit of an integral trace out a brand new function?
  2. Worked exampleFind g(3) and g(5) when g(x) is the integral of 2t dt from 0 to x.
  3. Common mistakeWhy isn't an accumulation function's value the same as the integrand's value?
  4. Going furtherWhat happens to the accumulation function when the integrand crosses the x-axis?
  5. Ties togetherHow does sliding this upper limit connect the area problem back to the limit definition of the derivative from Unit 2?

Check yourself

Your turn1 of 3
Let g(x) be the integral of 5 t dt from 2 to x. Find g(8).

End of topic.