HP 48gII Graphing Calculator Manual do Utilizador descarregar pdf (Página 216)

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Press J to see the newly created EQ variable:

Then, enter the SOLVE environment and select Solve equation…, by using:

‚Ï@@OK@@. The corresponding screen will be shown as:

The equation we stored in variable EQ is already loaded in the Eq field in the

SOLVE EQUATION input form. Also, a field labeled x is provided. To solve

the equation all you need to do is highlight the field in front of X: by using

˜, and press @SOLVE@. The solution shown is X: 4.5006E-2:

This, however, is not the only possible solution for this equation. To obtain a

negative solution, for example, enter a negative number in the X: field before

solving the equation. Try 3\@@@OK@@˜@SOLVE@. The solution is now X: -

3.045.

Solution procedure for Equation Solve...

The numerical solver for single-unknown equations works as follows:

• It lets the user type in or @CHOOS an equation to solve.

• It creates an input form with input fields corresponding to all variables

involved in equation stored in variable EQ.

• The user needs to enter values for all variables involved, except one.

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