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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=

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

''Yl(T>=2*SINC4sT)

Y2=

X3

BMEEaanii

w

iHiiiiBiranB

3-6 Plotting and Exploring Functions