Chapter 8 - Graphing Quadratic Functions - 8.3 - Graphing f(x) = ax^2 + bx + c - Exercises - Page 436: 1

We can tell if a quadratic function $f(x)=ax^{2}+bx+c$ has a maximum of minimum value based on the value of $a$. If $a\gt0$, the function has a minimum value. If $a\lt 0$, the function has a maximum value.

Let the quadratic function be $f(x)=ax^{2}+bx+c$. If $a\gt0$, the function has a minimum value. If $a\lt 0$, the function has a maximum value.