E

(Prompt for input for variable a) aInput 8 for variable a:8E bInput 5 for variable b:5E c

0

0

0

Input 5 for variable c:

 

 

 

 

0 3

: He r onFo rmu l a

5E

s

 

 

 

12

•As shown above, the calculation result appears after you assign values to all of the required variables.

•Pressing E while a calculation result is on the display will re-execute the formula from the beginning.

A Special Built-in Formula Variables (Formula Variables)

When you perform a calculation using a built-in formula, you assign values to the variables of the formula and calculate the result. In addition to the a, b, and c variables we saw

in Heron's formula above, there are also variables named r, t, v, ρ, and Ƨ. Since these variables are used only in built-in formulas, they are called formula variables.

Values you assign to formula variables when you perform a calculation with a built-in formula are retained until you change to another calculation mode, perform a memory clear operation (19(CLR)1(Mem)), or reset the calculator (19(CLR)3(All)). This means that you can execute a built-in calculation multiple times leaving one or more of the variables assigned with the same values as a previous execution, if you want.

Pressing E after performing the operation under “Performing Calculation with a Built-in Formula” will display the variable assignment screen again, with the previously assigned values as the initial defaults.

Prompt for input for variable a

a

8

 

 

Value previously assigned to variable a

If you want to leave the displayed value assigned to the variable, press E. In this case, pressing E will leave 8 assigned to variable a.

Note

Even if you select a different built-in formula, all variables that have the same names as the previously used formula will retain their current values.

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