1. Lesson 3

1.5. Explore 2

Mathematics 20-2 M3 Lesson 3

Module 3: Quadratics

 

Share 1
 

Based on your observations from the two animations, discuss the following questions with another student or appropriate partner.

  1. Explain how you can use a graphing calculator to find the following for a quadratic function:

    • coordinates of the vertex
    • range
    • axis of symmetry
    • x- and y-intercepts

  2. What settings with the ZOOM key seemed to be the greatest help?

  3. Which method did you find easiest for finding x-intercepts: the ZOOM method or the CALCULATE (zero) method? Explain.

  4. Summarize your discussion by creating a short paragraph describing how to find the vertex and intercepts of a quadratic function using a graphing calculator.

course folder Place a copy of your summary in your course folder.

 

Self-Check 1
 

Change the function in your calculator from Y1 = 0.6x2 + 3x + 2 to Y1 = 0.6x2 + 3x − 2. Note: Ensure you use the subtract key and negative key appropriately.

 

This graphic shows the locations of the subtract key and the negative key on a graphing calculator.

 



caution

Be careful that you correctly include any of the negative signs when discussing the coordinates of the vertex, the x- and y-intercepts, and the axis of symmetry. They are vitally important.

 

Use a graphing calculator to find the following. Where necessary, make sure to round your answer to two decimal places.

  1. coordinates of the vertex Answer

  2. axis of symmetry Answer

  3. x-intercepts Answer

  4. y-intercept Answer

  5. whether the function has a minimum or a maximum value Answer

  6. what the minimum or maximum value is Answer

  7. range of the function Answer