Hp 48g Graphing Calculator Manual de usuario descargar pdf (Pagina 257)

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Sometimes you may want to solve for a variable that’s stored in

another variable. To do this, you have to convert the algebraic so the

hidden variable is visible.

Sometimes you may want to speed evaluation by converting an

algebraic so all variables excepl certain ones are evaluated.

Showing Hidden Variables

1. Enter the expression onto the stack.

2. Do one of the following:

■ Enter the name (with ' delimiters) of the variable in the

expression that you do want to evaluate.

■ Enter a list containing the variable names in the expression that

you do not want e^■ aluated.

3. Press SYMBOLIC) :Bhüh . The expression will be partially

evaluated according to your wishes in step 2.

To ewaluate an algebraic for temporary wariable ¥alues:

1. Enter the algebraic onto the stack.

2. Enter a list that contains each variable name followed by the value

to substitute. For example: { narnej erprp „ „ „ namXn expr„y

where expr can be a number or a symbolic expression.

3. Press S3C SYMBOLICI (IMXT ) 1 to perform the evaluation. If a

variable named in the list currently exists (in the VAR menu), its

contents are not changed by the | (“where”) function.

Rearranging Symbolic Expressions

Manipulating Whole Expressions

You can sometimes simplify algebraics by expanding subexpressions or

collecting like terms. For example, if a variable occurs more than once

in an algebraic, you may be able to simplify it so the variable occurs

only once—letting you use ISOL to solve for the variable.

Calculus and Symbolic Manipulation 20-17

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Hp 48g Graphing Calculator Manual de usuario Pagina 257

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