Choose a new chapter
About ClassZone  |  eServices  |  Web Research Guide  |  Contact Us  |  Online Store
ClassZone Home
McDougal Littell Home
Algebra 1
Home > Algebra 1 > Chapter 9 > 9.3 Graphing quadratic functions > 9.3 Problem Solving Help
Return to book index Chapter 9 : Quadratic Equations and Functions
9.3 Problem Solving Help

Help for Exercises 72-75 on page 523

For Exercises 72-75, the given equation has a graph that is a downward facing parabola. The maximum height can be found using the vertex formula. Remember that the vertex formula will yield the value of t (the independent variable, time) for which the ball reaches its maximum height.

For Exercise 74, look at the symmetry of the parabola. The time it took for the ball to reach its maximum height will equal the time it takes for the ball to travel from this height to the point where it lands on the other side of the net.

For Exercise 75, refer to the photo. This offers a clear example of one way the path of the ball is affected. There are other variables that can also alter the path of the ball.