Defining expressions, Examples – HP 38g Graphing Calculator User Manual
Page 70
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Examples
: Defining Expressions
Function
Example
Define
- 2x + 3 .
Enter this expression as the right side of the equation in the
Symbolic view.
In the Symbolic view of the Function aplet, highlight a line (or
clear the lines) and enter the expression.
I
LIB
I
Select
Function.
{{START}}
{{X}} [ID 3 □ 2 0 {{X}} 0
3 I
ENTER
I
g FUNCTION SVMeOLIC VIEM^H
*'FKX>=X''3-2*X+3
F3CX)=
F4<:x>=
F5<X>=
i—HBnnniiUYIB
Remember that the equation that the HP 38G evaluates must
be in the form /(x) =
expression in terms of x.
Given this
exoression...
Rearrange it
to...
And enter...
3x + 2y - 4 = 0
y= -3/2x + 2
- 3 / 2 * X + 2
x^ + 7x+10 = 0
y = x' + 7 x + ] 0
X''2 + 7*X+10
x^ = 2x+7
y^ = 2 x + 7
y3 = y,
- Y 2
FI ( X ) = X ' ' 2 ,
F 2 ( X ) = 2 * X + 7 , a n d
F 3 ( X ) = F 1 ( X ) - F 2 ( X )
Parametric Define
x Q f ) =
3 sinSi
Example
y(i) = 2 sin4i.
In the Symbolic view of the Parametric aplet, highlight a line
(or clear the lines) and enter the expressions.
1
LIB
I
Select
Parametric
{{START}}
3 0 I
SIN
I 3 0 {{T}} I
ENTER
I
2 0 I
SIN
I 4 0 {{T}} I
ENTER
I
*FSR*METIilC SVHSnyC MIEW*
^X1<T)=3*SINC3*T>
''Yl(T>=2*SINC4sT)
Y2<T>=
X3<T)=
BMEEaanii
w
iHiiiiBiranB
3-6 Plotting and Exploring Functions