Being able to solve inequalities is important to be able to graph functions because you’ll often want to know when the derivative f’(x) is greater than 0 (meaning the original function f(x) is increasing) or less than 0 (meaning the original function f(x) is decreasing). Arun articulates this important concept, and Katie walks you through examples of solving inequalities.

Lesson 1: The Basics

Lesson 2: Solving equations and inequalities

Lesson 3: Graphing

Lesson 4: Limits and series