Minimum Option
The minimum of a function is found by using the extremum option.

While viewing a graph, press to view the math menu.

Move the cursor near the desired point of minimum and press to select the extremum option.

The coordinates of the minimum point appear at the bottom of the screen and are added to the stack. Here, the point is about (2.171 , -1).

Note: If there is more than one function the HP will find minimum points only on the first function. To rotate through functions select Next Equation by pressing in the math menu. The first equation will be put at the end of the list and all others move up one spot.