Module 2: Lesson 2

 

Are You Ready?

1. 
   
   1. To determine the x-intercepts, let y = 0.
      
      
       
      
      
      

      The x-intercepts are −3 and 3.
      
      

      To determine the y-intercepts, let x = 0.
      
      

       

      
      
      

      The y-intercept is −9.
      
      

      Using the form y = a(x − p)2 + q, you know that the vertex is (p, q).
      
      When you look at y = x2 − 9, the vertex is (0, −9). The a value is positive, so the parabola opens up and there is a minimum value of −9.

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