I laiwaitibhimiianj^wa, 3 x ded 3 y (spc), Zed s) w dhd s) l © (b s)ce3 2 q shu) © © s) – HP 48g Graphing Calculator User Manual

Page 141: Shhd, 3 z © b 0 © © 3 x

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Example:

Write a user-defined function to calculate the ratio of

surface area to volume of a box. The formula for this

calculation is

A 2{hw + hi + wl)

hwl

where h, w, and I are the height, width, and length of the

box.

Step 1:

First, create a user-defined function BOXS to calculate the
surface area of the box. Use the Equation Writer application

to key in the equation.

EQUATION 1

@ © BOXS r^fm S) H

(ZED S) w dHD S) L © (B

S)CE3 2 Q SHU) © © S)

H®S)W(©S)H

®S)L(T)S)W©S]L

Step 2:

Enter the equation and create the user-defined function.

(ENTER)

SHHD

Step 3:

Now create a user-defined function BOXR to calculate the
ratio of surface area to volume. Use the Equation Writer

application to key in the equation.

B0HS(K,y,z)

X'yzD

(Slf

equation

)

fspc)

Y fspcl

z © (F)

(UO

BOXS

Step Jf: Enter the equation and create the user-defined function.

I laiwaiTiBHimiianj^wa

(ENTER)

3(DEF)

uaiatl

Using Mathematical Functions 11-9

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