**Unformatted text preview: **TI 83/4: Finding Maximum and Minimum Points, and Zeros The TI-83/4 can be used to find high and low points on a graph, as well as the x-intercepts. Consider the graph of the third degree polynomial 3 2 f(x) x 4x 2x 8 =-- + =-- + =-- + =-- + as shown below. We can see that it has one high point, one low point, and three x-intercepts. To find these on the TI-83/4: 1) Enter the equation on a “y =” line, choose a window that shows the points of interest, and hit GRAPH. 2) 2 nd CALC 3) The next button depends upon which point we are interested in. If we are looking for an x-intercept, we hit #2 ZERO. If we are looking for a low point on a graph, we hit #3 MINIMUM. If we are looking for a high point, we hit #4 MAXIMUM. 4) We now have to give the calculator an interval inside of which the desired point is to be found. The TI-83/4 will prompt for a “left bound”, then “right bound”, then “guess”. We use the left and right cursor arrows to maneuver the on-screen cursor to the appropriate positions, hitting ENTER each time to cue the...

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