Lesson 4.1 Graph Quadratic Functions in Standard Form Lesson 4.2 Graph Quadratic Functions in Vertex or Intercept Form Lesson 4.3 Solve x^2 + bx + c = 0 by Factoring Lesson 4.4 Solve ax^2 + bx + c = 0 by Factoring Lesson 4.5 Solve Quadratic Equations by Finding Square Roots Lesson 4.6 Perform Operations with Complex Numbers Lesson 4.7 Complete the Square Lesson 4.8 Use the Quadratic Formula ... Lesson 1.2 1.2 Geo-Activity (p. 8) 1. 4 people can shake hands 6 ways. 2. 5 people can shake hands 10 ways. 3. 4. Numbers after the first are found by adding consecutive whole numbers. So, the number of ways that 6 people can shake hands is 10 5 or 15 ways. 1.2 Checkpoint (pp. 9–10) 1. The product of any two odd numbers is an odd number. 2.