# Example 3 + up/down test

[![image.png](https://library.naruzkurai.tk/uploads/images/gallery/2023-04/scaled-1680-/7d9YkosVwD1B89qL-image.png)](https://library.naruzkurai.tk/uploads/images/gallery/2023-04/7d9YkosVwD1B89qL-image.png)

##### up/down test

- opens upwards because a is Positive
- opens downward because a is Negative

##### Example 3

1. a) y= x^2 + 3x + 4 
    - opens upwards because a is Positive
2. b) y = -3x^2 + 5x  
    
    - opens downward because a is Negative
3. c) y = 2x - x^2 + 6  
    
    - opens downward because a is Negative