In this video the teacher shows us how to use a TI84 plus graphing calculator to graph a function, adjust the view window, and determine the values of several types of critical points on the graph such as xintercept, yintercept, local maximums, and local minimums. After entering the function in the Y= editor she presses the ZOOM button and selects ZStandard this adjusts the view window to a range of 10 to 10 on both axis. To find each of the critical points requested the teacher uses the CALC menu by pressing 2nd then CALC then selects the appropriate menu option. Once the option is selected she shows how you must move the cursor to both the left and right of the critical point pressing ENTER after each input. This procedure does not work for finding the yintercept, to do this she uses "value" in the CALC menu and enters X=0 to determine the yvalue. The teacher then uses the information she gathered about local maximums and minimums to record where the function is increasing and decreasing, this is done by looking at the shape of the graph and using the xvalues determined for the local maximums and minimums.
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