This Discussion re-visits the rules of differentiation studied in Module 3.

1. For the function 2a that you created in Discussion 1, identify the coordinates of four points such that the slope of the tangent line at that point is:
   • zero
   • undefined
   • positive
   • negative
2. Evaluate the derivative at the points you identified in step 1.
3. Write a paragraph summarizing the relationship between the continuity of a function, the limit of a function, the slope of a tangent line, and the derivative evaluated at a point. Use your work in Discussions 1-4 to support the conclusion.

Equation 2a is y=y=x24+1x