Algebra 2 4-3 Complete Lesson: Modeling With Quadratic Functions

Problem 3 Got It? The table shows a meteorologist's predicted temperatures for a summer day in Denver, Colorado.

1. Add a table to the embedded Desmos graphing utility and plot the points from the meteorologist's table. As in Problem 3, use a 24-hour clock when entering times into the table. Zoom and pan your graph to establish an appropriate viewing window.

2. On the next Desmos row, add a quadratic regression function to model the data. Recall Desmos' regression notation: y₁ ~ ax₁² + bx₁ + c.

3. Use the model to predict the high temperature for the day. Click the parabola once to select it, then click at the point representing the high temperature (the vertex) of the quadratic model to add a label that identifies its coordinates. Be careful not to select the point from the table that is near to the vertex. Be sure the label is shown in the viewing window before moving on.

Error Analysis: Your classmate says he can write the equation of a quadratic function that passes through the points (3, 4), (5, -2), and (3, 0). Explain his error.

Review Lesson 4-2: Graph the functions on the same plane. Zoom and pan your graph to establish an appropriate viewing window.

Review Lesson 3-2: Solve the system by elimination on the canvas. Show each step and write the solution in the space provided.

Review Lesson 2-2: y varies directly with x. Match each direct variation with its solution.

Review Lesson 1-3: Match each expression with its simpler form.

Vocabulary Review: Identify the graphs that are NOT parabolas.

Use Your Vocabulary: Match each description on the left with the equation that models it on the right.

Modeling: Consider the table showing a meteorologist's predicted temperatures for the day.

Which calculator screen below shows the correct data entry for a quadratic model?

Notes: Take a clear picture or screenshot of your Cornell notes for this lesson. Upload it to the canvas. Zoom and pan as needed.

For a refresher on the Cornell note-taking system, click here.

Reflection: Math Success

Solve It! What equation, in standard form, models the path of the ball? Hint: Let the x-axis model the horizontal line at waist level and use the x-intercepts.

Problem 2 Got It? What is a reasonable domain and range for each quadratic model?

Problem 2 Got It? Reasoning: Describe what the domains tell you about each of the models and why the domains for the models are different.