Applications of quadratic functions  Quadratic Functions
Applications of quadratic functions
Basic concepts:
 Quadratic function in general form: $y = ax^2 + bx+c$
 Quadratic function in vertex form: y = $a(xp)^2 + q$
 Converting from general to vertex form by completing the square
 Shortcut: Vertex formula
Related concepts:
 Applications of quadratic equations
 Factor theorem
Lessons

4.
John stands on the roof of a building and throws a ball upwards. The ball’s height above the ground is given by the formula: $h =  3{t^2} + 12t + 15$, where h is the height in meters at t seconds after the ball is thrown.

5.
A school Halloween dance charges $5 for admission, and 200 students are willing to attend the dance. For every 25 cents increase in price, attendance drops by 4 students.