Exact Polynomials with Known Coefficients

If you know the coefficients of the polynomial, use the following procedure to run the Exact Polynomials program.

Starting the Program

To start the Exact Polynomials program:
  1. Select { INT } from the MATHEMATICS menu.
    The program displays:
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  2. Press { PLY }.
    The program displays:
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  3. Press { OLD }.
You can then begin entering the coefficients of the polynomial.

Entering Coefficients

When you select { OLD } from the EXACT POLYNOMIAL menu, the program displays:
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  1. Enter the degree of the polynomial and press { deg }.
  2. Press { EOD }.
    The program prompts you to enter the coefficient of each term, beginning with the x0 term.
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  3. Enter the coefficient and press { ENT }.
  4. Repeat step 3 until all the coefficients are entered.
The program then displays the menu shown in the next section below.

The Edit Menu

After you enter all the coefficients, the program displays an EDIT? menu that allows you to change any of the values.
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  • If you do not want to edit any values, press { NO }, and proceed to the section on interpolating below.
  • If you want to edit a value, press { YES }, and use the procedure given in the next section below.

Editing the Coefficients

When you select { YES } from the EDIT? menu, the program displays the same menu that you used to enter the coefficients.
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  • To display the current value of the first coefficient, press the [ CE ] key.
  • To accept the current value and proceed to the next coefficient, press { ENT }.
  • To edit the current value, enter the correct value and press { ENT }.
When you press { ENT } to accept or edit the value of the last coefficient, the program returns to the EDIT? menu. Selecting { NO } from that menu lets you interpolate.

Interpolating

When you select { NO } from the EDIT? menu, the program displays:
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To interpolate:
  1. Enter a value for x and press { x }.
    The program displays the corresponding value of y, for example:
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  2. Repeat step 1 for any other value of x.

Exiting the Program

When you are finished interpolating and are ready to exit the program:
  1. Press { ESC }.
    The program displays the following menu. This menu is normally used for "Exact Polynomials with Known Data Points".
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  2. Press { ESC } to return to the EXACT POLYNOMIAL menu.

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