© Texas Instruments, 2007
TI-84 Plu Silver Edition Expre ion , Menu , and Graphing
Defining or Editing a Function for Graphing
To Define or Edit a Function
1Press oto display the Y= editor.
2Press Üto move the cursor to the
function you want to define or edit.
To erase a function, press ë.
3Enter or edit an expression to define
the function.
Displaying a New Graph
To display a graph of the selected function,
press s. TRACE, ZOOM, and CALC
operations display the graph automatically.
As the graph is plotted, the usy indicator is
on, and the X and Y values are updated.
Free-Moving Cursor
When you first display the graph, no cursor is visi le. You must press
|~}or Üfor the cursor to move from the center of the viewing
window. Continue pressing |~}or Üto move the cursor around.
Tracing a Function
Use the TRACE operation to move the cursor from one plotted point
to the next along a function. To egin, press r. The TRACE cursor
is on the first selected function in the Y= editor, centered horizontally
on the screen. The cursor coordinates are displayed at the ottom of
the screen if CoordOn format is selected. The Y= expression is displayed
in the top left corner of the screen if ExprOn format is selected.
Moving the TRACE Cursor
To move the TRACE cursor Do this:
To the previous or next plotted point Press |or ~
Five plotted points on a function Press y | or y ~
(Xre affects this)
To any valid X value on a function Enter a value & press Õ
From one function to another Press }or Ü
To alter the viewing area of the graph, press qq
ZOOM MEMORY
1: ZBox Draws a ox to define the viewing window
2: Zoom In Magnifies the graph around the cursor
3: Zoom Out Views more of a graph around the cursor
4: ZDecimal Sets ⌬X and ⌬Y to 0.1
5: ZSquare Sets equal-size pixels on the X and Y axes
6: ZStandard Sets the standard window varia les
7: ZTrig Sets the uilt-in trig window varia les
8: ZInteger Sets integer values on the X and Y axes
9: ZoomStat Sets the values for current stat plots
0: ZoomFit Fits Ymin and Ymax etween Xmin and Xmax
To display the CALCULATE menu, press yy //
CALCULATE
1: value Calculates a function Y value for a given X
2: zero Finds a zero (x-intercept) of a function
3: minimum Finds a minimum of a function
4: maximum Finds a maximum of a function
5: intersect Finds an intersection of two functions
6: dy/dx Finds a numeric derivative of a function
7: ∫f(x)dx Finds a numeric integral of a function
To return to the Home Screen from any other screen, press yy 55.
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Entering Expressions and Instructions
What is an Expression?
An expression is a group of num ers, varia les, or functions and
their arguments, or a com ination of these elements. An expression
evaluates to a single answer. For example, ()
2is an expression. On the
TI-84 Plus Silver Edition, you enter an expression in the same order as
you would write it on paper. You can enter an
expression on the home screen to calculate
an answer.
Entering an Expression
To create an expression, you enter num ers, varia les, and functions
from the key oard and menus on your TI-84 Plus Silver Edition. An
expression is completed when you press Õ, regardless of the
cursor location. The entire expression is evaluated according to
Equation Operating System (EOS™) rules (see General Math page),
and the answer is displayed. When an entry is
executed on the home screen, the answer is
displayed on the right side of the next line.
The mode settings control the way the TI-84 Plus Silver Edition interprets
expressions and displays answers. If an answer, such as a list or matrix,
is too long to display entirely on one line, an
ellipsis (...) is displayed to the right or left.
Press ~or |to display the rest of the answer.
To display the MATH menu, press çç
MATH NUM CPX PRB
1: Frac Displays answer as a fraction
2: Dec Displays answer as a decimal
3: 3Calculates cu e
4: 3√(Calculates cu e root
5: x√Calculates xth root
6: fMin( Finds minimum of a function
7: fMax( Finds maximum of a function
8: nDeriv( Computes numeric derivative
9: fnInt( Computes integral of a function
0: Solver... Displays equation solver
To display the MATH NUM menu, press çç ~~
MATH NUM CPX PRB
1: a s( Computes a solute value
2: round( Rounds value to specified decimal place
3: iPart( Calculates integer part
4: fPart( Calculates fractional part
5: int( Finds greatest integer less than or equal to num er
6: min( Finds minimum value
7: max( Finds maximum value
8: lcm( Calculates least common multiple
9: gcd( Calculates greatest common divisor
To display the MATH PRB menu, press çç ||
MATH NUM CPX PRB
1: rand Generates random num er etween 0 and 1
2: nPr Computes num er of permutations
3: nCr Computes num er of com inations
4: ! Calculates factorial
5: randInt( Generates random integer in specified range
6: randNorm( Generates random # from Normal distri ution
7: randBin( Generates random # from Binomial distri ution
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