Using Xeq For Evaluation; Responding To Equation Prompts - HP 33s User Manual

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Using XEQ for Evaluation

If an equation is displayed in the equation list, you can press
equation. The entire equation is evaluated, regardless of the type of equation. The
result is returned to the X–register.
Example: Evaluating an Equation with XEQ.
Use the results from the previous example to find out how much the volume of the
pipe changes if the diameter is changed to 35.5 millimeters.
Keys:
º d
t
¥
¥
35.5
¥
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The value of the equation is the old volume (from V) minus the new volume
(calculated using the new D value) — so the old volume is smaller by the amount
shown.

Responding to Equation Prompts

When you evaluate an equation, you're prompted for a value for each variable
that's needed. The prompt gives the variable name and its current value, such as
 .
To leave the number unchanged, just press
6–12
Entering and Evaluating Equations

Display:
 








Changes cubic millimeters to
liters (but doesn't change V ).
t
Description:
Displays the desired equation.
Starts evaluating the equation to
find its value. Prompts for all
variables.
Keeps the same V , prompts for D .
Stores new D , Prompts for L .
Keeps the same L ; calculates the
value of the equation — the
imbalance between the left and
right sides.
Changes cubic millimeters to liters.
¥
.
to evaluate the