Write a quadratic function given the following information 18. The parabola opens downward and has zeros at (5,0) and (-3,0) 19. The parabola opens upward and has zeros at (-7,0) and (14,0) 20. The parabola opens downward and has a vertex at (4,-3) 21. The parabola opens upward and has a vertex at (-6,5) Still to come in this unit: 1. Graphing quadratic functions 2. Transformations of a quadratic equation