We need to use the first option, “value,” which is automatically highlighted when the menu appears. On the TI-84 Plus, press the “2 ND ” and then the “Trace” button to access this feature.Ī menu with the title “CALCULATE” should appear. To insert “x” values into the graph and find the corresponding “y” values, you will need to use the “Calc” function on the calculator. In this example, the graph should draw a straight, diagonal line. You can then press the graph button on the calculator, which will then instruct the calculator to draw a graph of the function. Navigate your cursor to Y 1 and feed the function into it. A screen with Y 1, Y 2, Y 3, and so on will appear. Now that you have a table ready to note the values down press the “Y=” button on your calculator. Grab a piece of paper and a pen, and make a table with values close to -3, like so: x Now, in this method, instead of letting the table do the work, we will type in the values closest to -3 into the calculator. Let’s explain this approach by finding the limit of the function Method #3: Estimating a Limit Using Graphing Function From this, we can almost certainly conclude that 10 is the limit. You will see that the value of y gets close to 10 as the x value closes in on 5 from both above and below. You will see a table similar to the one below: x Scroll along the results and find a few numbers less than five. Now, when you press the “Table” button, the table will appear. The ∆Tbl value defines the size of the increments of “x” in the table. Then enter a small number like 0.001 as the ∆Tbl value. Next, navigate to the “table set up” menu and enter the arrow number, which in this case is 5, as the table start number. Let’s use the same example as before and enter y = into the calculator. Next, you must enter the equation that you want to find the limit of. Turn on your calculator and switch to its graphing mode. Most new scientific calculators come with this function built-in. To use this method, you will need a calculator with a graphing function. Method #2: Evaluating Limits Using Tables However, you will get the same result if you use the same technique with another calculator. We’ve explained this method using the TI-84 scientific calculator. This makes it almost certain that the answer we’re looking for is 10. The answer you see should be 10.0001, which is extremely close to the round number 10. Type in 5.0001 in the calculator, hit “Sto,” and then enter the function into the calculator. Let’s take 5.0001 and go through the process again. The next step is to test the function from the other side by plugging in or substituting a number that’s greater than 5. With this, we can conclude that the answer is likely 10. You will notice that the result for this example is 9.9999, which is extremely close to the round number 10.
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