Lesson 3

The graphing calculator is just another tool you can use to help solve problems that can be modelled by quadratic functions. By applying the characteristics of quadratic functions you learned in Lessons 1 and 2, you can ensure that the graph you are seeing on the calculator is a reasonable representation of the function. For instance, if the graph of a function with a negative a (a < 0) value when written in standard form opens upwards and has a minimum value on your calculator screen, chances are you forgot to enter the minus sign. Thus, it is a good idea to always keep in mind the key characteristics of the graph you are working with.

 

Self-Check 3

 

Complete “Practising” questions 12, 13, and 16 on pages 335 and 336 of the textbook. Answer

 

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