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TI-84 Plus Calculator Reference Sheet, Cheat Sheet of Mathematics

Finlandia UniversityMathematics

learn to use various functions and keys on TI 84 calculator

Typology: Cheat Sheet

2020/2021

Uploaded on 04/23/2021

lumidee
lumidee 🇺🇸

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TI-84 PLUS CALCULATOR REFERENCE SHEET
1) Graphing a Function (linear, quadratic, exponential or absolute value)
a. Press y= and enter as many functions as you wish to graph
b. Press graph to see the actual graphs
c. Press 2nd then graph (table) to view the table of values
d. Press zoom to adjust the view of the graph.
i. #6 will always take you back to a normal 10x10 grid
ii. #0 is the option for making the graph fit the data
iii. #9 is used to see a statistics graph (scatter or residual)
e. Press window to manually change the x or y-axis to fit the data or region you
want to view. This is very helpful when graphing a select interval
2) Entering x/y values from a table or graph to find the equation of the function
a. Press stat, then edit. Enter all of your x-values in L1 and your y-values in L2
b. If you need to clear your lists from a prior problem, go up to highlight the L1
or L2, then press CLEAR and ENTER. This will erase the information
c. Once you’ve entered the data, you will go to STAT, go across to CALC and
pick your option based on the type of function
i. For linear, choose option #4 LinReg(ax+b). Depending on the model of
the calculator you have, you may enter once or more until it calculates
the data providing you with the a-value and the b-value. The a-value
is the m or slope of your equation. The b-value is your y-intercept
ii. For quadratic, choose option #5 QuadReg. Again depending on your
model will depend on the number of times you press enter. The
calculator provides you the a, b and c values for your ax2+bx+c
quadratic function
iii. For exponential, choose option #0 ExpReg. Enter as many times as
necessary. This provides you with an a and b value to place into
y=a*bx
3) Plotting Scatter Plots, Finding the Line of Best Fit and Calculating the
Correlation Coefficient
a. Make sure your diagnostics are ON. Do this by pressing 2nd then 0 (catalog).
Scroll down to DIAGNOSTIC ON, press enter twice until you see DONE
appear
b. Next go to STAT, EDIT and enter your data into your lists. See above for
steps to clear the lists. Once you have entered all the data, you can
calculate the line of best fit by following steps 2ci from above which show
how to calculate LinReg. One addition will be the R value value which appears
on that screen. This is your correlation coefficient. Remember the closer
pf3
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TI-84 PLUS CALCULATOR REFERENCE SHEET

1) Graphing a Function (linear, quadratic, exponential or absolute value) a. Press y= and enter as many functions as you wish to graph b. Press graph to see the actual graphs c. Press 2nd^ then graph (table) to view the table of values d. Press zoom to adjust the view of the graph. i. #6 will always take you back to a normal 10x10 grid ii. #0 is the option for making the graph fit the data iii. #9 is used to see a statistics graph (scatter or residual) e. Press window to manually change the x or y-axis to fit the data or region you want to view. This is very helpful when graphing a select interval

2) Entering x/y values from a table or graph to find the equation of the function a. Press stat, then edit. Enter all of your x-values in L1 and your y-values in L b. If you need to clear your lists from a prior problem, go up to highlight the L or L2, then press CLEAR and ENTER. This will erase the information c. Once you’ve entered the data, you will go to STAT, go across to CALC and pick your option based on the type of function i. For linear, choose option #4 LinReg(ax+b). Depending on the model of the calculator you have, you may enter once or more until it calculates the data providing you with the a-value and the b-value. The a-value is the m or slope of your equation. The b-value is your y-intercept ii. For quadratic, choose option #5 QuadReg. Again depending on your model will depend on the number of times you press enter. The calculator provides you the a, b and c values for your ax^2 +bx+c quadratic function iii. For exponential, choose option #0 ExpReg. Enter as many times as necessary. This provides you with an a and b value to place into y=a*bx

3) Plotting Scatter Plots, Finding the Line of Best Fit and Calculating the Correlation Coefficient a. Make sure your diagnostics are ON. Do this by pressing 2nd^ then 0 (catalog). Scroll down to DIAGNOSTIC ON, press enter twice until you see DONE appear b. Next go to STAT, EDIT and enter your data into your lists. See above for steps to clear the lists. Once you have entered all the data, you can calculate the line of best fit by following steps 2ci from above which show how to calculate LinReg. One addition will be the R value value which appears on that screen. This is your correlation coefficient. Remember the closer

to 1 or -1, the stronger the line of best fit and the closer to zero it is, the weaker the line is for reliability c. To view the graph, you enter 2nd^ then y= to enter the STAT PLOT screen. You must turn on the first stat plot which will enable you to graph scatter plots d. Next you go to zoom and choose option #9 for zoomstat to see this scatter plot. If you wish to also graph a line of best fit, you can enter that into the y= to have it appear between your plots e. When you are done, remember to go back and undo step 3c, which is to turn off your statplot otherwise you can’t graph a normal function. Also you need to hit zoomstandard which is option #6 to return to a 10x10 grid

4) Finding the zeros of a quadratic function a. Enter a quadratic equation into the y= screen b. Press 2nd^ Trace (Calc) then option 2 ZERO c. Move the spider monkey to the left bound (Left side of the point where the graph intersects the x-axis) and then press enter. Use right/left arrows to move the spider monkey d. Move the spider monkey to the right bound (Right side of the point where the graph intersects the x-axis) and then press enter. Use right/left arrows to move the spider monkey e. Just push Enter for the Guess and your point should appear with an x and y value f. Repeat these same steps for the other point where the graph crosses the x- axis if there are 2 roots

5) Finding the minimum or maximum value of a quadratic a. Enter a quadratic equation into the y= screen b. Press 2nd^ Trace (Calc) then option 3 Minimum or 4 Maximum depending on if the x^2 is positive (min) or negative (max) c. Move the spider monkey to the left side of the max or min point and press enter for the left bound d. Move the spider monkey to the right side of the max or min point and press enter for the right bound e. Press enter for the Guess and your point will appear with an x and y value

6) Locating points of intersection between two functions a. Enter a quadratic equation into the y= screen b. Press 2nd^ Trace (Calc) then option 5 INTERSECT c. Move the spider monkey near the point of intersection and press enter (this is your first curve)

10) General Calculator Reminders/Functions a. To enter a fraction, you can either use parenthesis to create a fraction (division) such as (2/18), or if you have one of the new calculators simply press ALPHA then y= and choose option 1 (n/d) which will give you a fraction b. To convert a decimal answer to a fraction, choose math, then option 1 FRAC and it will provide you a fraction in lowest terms c. To enter a cube root, again choose MATH, option # d. For absolute values, enter MATH, then go across to NUM and pick option 1 abs e. To round a decimal to a certain number of places, enter MATH, then go across to NUM and pick option 2 round(. Enter the long decimal, then a comma and then how many decimal places you need followed by closing the parenthesis and then ENTER. Example: round(4.56789, 2) will provide an answer rounded to the nearest hundredth of 4. f. To raise anything to an exponent larger than 2, you can you the ^ then enter the exponent. Example: 4^5 would be entered as 4^5 enter to get 1024 g. If your calculator becomes stuck and won’t do anything, hit 2nd, + (mem), 7 reset, 1 All RAM, 2 reset, enter until it says all RAM CLEARED