Quadratic Functions - Definition & Examples

Cameron is fundraising by selling some donuts.

The function $-x^2+12x-20$ roughly represents the amount of donuts Cameron is selling. $x$ represents times in hours––for example, when $x=5$, the function is the amount of donuts Cameron sold during the $5^{\text{th}}$ hour.

However, the function equals a negative number sometimes (you can check this by graphing the function), although Cameron cannot sell a negative amount of donuts. When the amount is negative, we simply record that Cameron sold $0$ donuts.