Download TI-84 Calculator Help

TI-84 CALCULATOR HELPS
1. To clear the calculator : [2nd] [+] [7] [1] [2]
To reset the entire Memory of Calculator [2nd] [+] [7] [→] [→](to ALL) [1] [2]
2. Change to Fraction: enter number or decimal [MATH] [1: FRAC] [ENTER]
3. Change to Decimal: enter fraction [MATH] [2: DEC] [ENTER]
4. Bring up last entry: [2nd] [ENTER]
5. To use the answer from the last problem: [2nd] [(-)]
6. Change to degrees for trig problems: [MODE] highlight degree [ENTER] [2ND] [MODE]
7. See graph & table together: [MODE] highlight G-T [ENTER] [2ND] [MODE]
8. To get to the table: [2nd] [GRAPH]
9. Cubing a number a3
[MATH] [3: 3] [ENTER]
10. Cube root a number [MATH] [4: 3 ] [ENTER]
11. Clear STAT lists: scroll up to L1, L2, etc & press [CLEAR], scroll down & they should be clear
If your L1 or L2 is missing you need to reset the entire Memory of Calculator
[2nd] [+] [7] [→] [→](to ALL) [1] [2]
12. ERROR WHEN GRAPHING: check STAT PLOT and make sure they are off, press [STAT PLOT]
key and if they are on, press [ENTER] and move cursor over OFF and press [ENTER]
13. DOMAIN ERROR: your line is an x = not a y = OR fix your window…
To adjust the window
Y MAX
look in these places
on your graph for the
correct numbers
X MIN
If you can’t see your graph:
[ZOOM] [0: ZOOMFIT]
X MAX
Y MIN
14. SYNTAX ERROR: check your entry for subtract button instead of [(-)] negative
15. To get to anything you can’t find: [2nd] [0] for the catalog and scroll up or down
FIND EQUATION OR SLOPE WHEN GIVEN TABLE OF VALUES OR
GIVEN 2 Points
Clear calc first or clear STAT lists (Press [STAT] [EDIT], move cursor over L1, press [CLEAR], move
cursor back down. List should be clear). To enter info: press [STAT] [EDIT], under L1, enter all x
values & under L2 enter all y values. Press [2nd] [MODE] [STAT] [CALC] [4: LinReg (ax+b)]
[ENTER]
***fill in “a” and “b” for given equation*** **BE SURE TO CLEAR LISTS WHEN FINISHED**
TI-84 CALCULATOR HELPS
SOLVE LINEAR EQUATIONS (4 different ways)
GRAPH
GRAPH (2)
Press [Y1 = ]
Press [Y1 = ]
Enter equation
Enter equation
See where the line crosses the x axis
Press [Y2 = ]
Enter 0
Press [2nd] [TRACE] [5: intersection] [ENTER] 3 times
Your answer is at the bottom, X = ____
SOLVER
Press [MATH] [0: SOLVER]
Enter equation
[ALPHA] [ENTER]
TABLE
Press [Y1 = ]
Enter equation
Press [2nd] [GRAPH]
Answer is X = ____
Look in 2nd column for where y = 0
INTERSECTION OF GRAPHS: USE TO SOLVE 1 OR 2 EQUATIONS
Enter the 1st equation or the left side of the equation in Y1 =
Enter the 2nd equation or the right side of the equation in Y2 = , press [GRAPH]
***make sure you can see the intersection, see window note if you cannot see where they cross***
Press [2nd] [TRACE], go down to [5: intersection], press [ENTER] 3 times
SOLVE 2 VARIABLE EQUATIONS USING MATRICES
Set up as 2 x 3 matrices as follows
Coefficients * variables = answers
ax +by = c
dx+ey = f
To enter 1st matrix, press [2nd] [x-1] [EDIT] [1]
Enter number of rows then columns for 1st matrix
Enter data, when finished [2nd][MODE]
To enter answer matrix, press [2nd] [x-1] [EDIT] [2]
Enter number of rows then columns for answer matrix
Enter data, when finished [2nd][MODE]
**To get answer: [2nd] [x-1] [1] [x-1] [2nd] [x-1] [2] [ENTER]**
TI-84 CALCULATOR HELPS
SOLVE 2 VARIABLE EQUATIONS
USING GRAPHING
You must change both equation to look like y = mx + b
Graph the 1st equation as Y1 =
Graph the 2nd equation as Y2 =
[2nd] [TRACE] [5: Intersection] [ENTER] 3 times
***answer is at the bottom for x and y***
***it is where they intersect***
GRAPHING INEQUALITIES
If you want it to graph <, scroll to the left of Y1 and press [ENTER] until appears
If you want it to graph >, scroll to the left of Y1 and press [ENTER] until appears
Put your equation (set equal to 0) in for [Y1 = ] and press [GRAPH] Press [2nd] [^]
FIND THE Solutions, Roots, Zeros, or X-intercepts OF A QUADRATIC
EXAMPLE: f(x) = -x2 + 4x
GRAPH
[Y=] put in equation [TRACE], look for where everywhere it crosses the x axis (you may also use the
table to see where y = 0 to get the values of x which are your answers) If the coefficient of x is not 1
you might need to change the table set [2nd] [WINDOW] go down to ∆Tbl = 1/coefficient Then return
to the table to find the zeros.
SOLVER
Clear the calculator
[MATH] [SOLVER], type equation, press [ENTER], then [ALPHA] [ENTER] to get the 1st answer
Type 100 in for x and press [ALPHA] [ENTER] to get 2nd answer
TO FIND THE FACTORS OF A NUMBER
[Y = ], enter the number you want factored, press [/] then [X,T,n], then [2ND] [GRAPH]
***look for all the whole numbers in both the X and Y columns***
FINDING THE LEAST COMMON MULTIPLE B/W 2 NUMBERS
[MATH] [NUM] [8: lcm( ], enter the 1st number [,] enter the 2nd number [ ) ] [ENTER]
TI-84 CALCULATOR HELPS
DATA SETS and CENTRAL TENDANCIES
EXAMPLE: 5, 4, 5, 6, 5, 4, 2, 6, 7, 9
To do the following below, you must enter the data under [STAT] [EDIT] then under L1, [2nd]
[MODE]
EDIT: press [STAT] [ENTER] and enter or change data in any column (remember which column you
put the data in.
NEW COLUMN: go up the last L column and press the [ > ] key to get a new column, the calculator
will prompt you for a name, type in the name and press enter
MEAN : [2ND] [STAT] [MATH] [3: MEAN( ]
MEDIAN: (med) [ 2ND] [STAT] [MATH] [4: MEDIAN( ]
SUM : [2ND] [STAT] [MATH] [5: SUM]
MODE : You will have to find the most repeated number, but putting the list in order will make it easier
to find the mode.
TO PUT A LIST IN ORDER lowest to highest: Put the list in the L column using [STAT] [1:EDIT]
then [STAT] [2:Sort A(] [2ND] [STAT] and choose the L your numbers are in [ENTER] then calculator
will say done. When you go back to your list in [STAT] [1:EDIT] the list will be in order
TO PUT A LIST IN ORDER highest to lowest: Put the list in the L column using [STAT] [1:EDIT]
then [STAT] [3:Sort D(] [2ND] [STAT] and choose the L your numbers are in [ENTER] then calculator
will say done. When you go back to your list in [STAT] [1:EDIT] the list will be in order
ALL STATS AT ONCE: [STAT] [CALC] [1: 1-VAR STATS] [ENTER], then you have to tell the
calculator which list you want stats on, so press[2ND] [STAT] and under names, pick the list you want
and press enter, scroll down to find any stat you want for that list
= average or mean
∑ x = sum of all the numbers
n = how many numbers are in the list
min x = smallest number in list
Q1 = start of the lower quartile
med = median
Q3 = start of the upper quartile
max x = largest number in the list
⨱
SOLVE EQUATION FOR 1 VARIABLE
EXAMPLE: 6(x – 4) – (x – 3) = x – 1
GRAPH
Under [Y1] enter 6(x – 4) – (x – 3)
Under [Y2] enter x – 1
[GRAPH] [2ND] [TRACE] [5: Intersection] [ENTER] 3 times
X=5
TI-84 CALCULATOR HELPS
IF GIVEN ANSWER CHOICES
Pick one of the answer choices
Enter the number, press [STO], then [X,T,,n]
Then press enter
Enter the left side of the equation, press enter
Enter the right side of the equation, press enter
If they match, that is the correct answer
If not, pick another answer and try again.
TO SOLVE EQUATIONS USING THE SOLVER
[MATH] go down to [0: SOLVER], enter equation that is equal to zero [ENTER]
Then [ALPHA] [ENTER], your answer is where it says X = ____
****be sure to clear your calculator when finished using the solver****
**if there should be 2 answers, change the x = to 100 and then [ALPHA] [ENTER] to get the 2nd
answer**
Adapted from original created by Kimberly Calton