Hp 48g Graphing Calculator Bedienungsanleitung PDF herunterladen (Seite 214)

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101

3. Press Q and then the unknown variable’s white menu key. The

labeled result will be returned to stack level 1 and a message

interpreting the result is displayed at the top of the screen.

4. Optional: Press EXPR= to evaluate the current equation using the

newly computed value for the unknown variable. See “Interpreting

Results” on page 18-3 for more details about intrepreting the

results of the root-finder.

Additional Solving Options in SOLVR

In addition to providing a different environment for finding roots of

equations, expressions and programs, SOLVR allows you a few options

not available in the SOLVE application.

To sequentially solve a series of equations using SOLVR:

1. Enter the equations that you want to use onto the stack in the

order that you will probably want to solve them. Begin with

the equation containing only one unknown variable. The other

equations may begin with additional unknown variables, although

they should have only one variable that remains unknown after

each of the equations preceeding it have been solved.

2. Press repeatedly until the stack pointer indicates the first

equation to be solved.

Press

-i-L

ST (enter)

to gather the equations into a list.

4. Press (<i^fsolve) R00T EG! to store the list into EQ as

the current “equation.”

5. Enter the SOLVR environment, enter values into the known

variables, and solve for the unknown variable in the first equation

as you would if there were only one equation.

6. Press NXEQ (you may need to press (NXT~) one or more times

if there are many variables) to make the “next” equation in the

list into the current equation. The equations are actually rotated

within the list, so that the first equation is now the last, the second

equation now the first, the third now the second, and so forth.

7. Enter any additional known values and solve for the remaining

unknown variable in the equation.

8. Repeat steps 6 and 7 until you have solved for all of the unknown

variables in the series of equations.

You may prefer to use the Multiple Equation Solver instead of SOLVR

for this kind of task (see page 25-6).

18-8 Solving Equations

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