Solution 34845: Finding the Minimum or Maximum (Vertex) of a Function on the TI-83 Plus and TI-84 Plus Family of Graphing Calculators.
How do I find the minimum or maximum of a function on the TI-83 Plus and TI-84 Plus family of graphing calculators?
To find the minimum or maximum of a function follow the example below.
Example: Find the maximum of the function (-3x2 - 6x + 2)
1) Press [Y=] to access the Y= editor. For Y1, input (-3x2-6x+2).
2) Press [GRAPH] to graph the parabola.
3) Press [2nd] [TRACE] [4] to select the "maximum" command from the CALC menu.
4) The
handheld will prompt for a "Left Bound." press [(-)] [2] then [ENTER].
5) The
handheld will prompt for a "Right Bound." press [0] then [ENTER].
6) The
handheld will prompt for a "Guess." Using the arrow keys, move the
cursor as close as possible to the actual maximum point and press
[ENTER].
The handheld will display the maximum point as a coordinate pair.
Please see the TI-83 Plus and TI-84 Plus Family guidebooks for additional information.
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