Hp 50g Graphing Calculator Manual do Utilizador descarregar pdf (Página 214)

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101

Page 6-8

Press ˜ to trigger the line editor to see all the coefficients.

Generating an algebraic expression for the polynomial

You can use the calculator to generate an algebraic expression for a

polynomial given the coefficients or the roots of the polynomial. The resulting

expression will be given in terms of the default CAS variable X. (The examples

below shows how you can replace X with any other variable by using the

function |.)

To generate the algebraic expression using the coefficients, try the following

example. Assume that the polynomial coefficients are [1,5,-2,4]. Use the

following keystrokes:

‚Ï˜˜@@OK@@ Select Solve poly…

„Ô1‚í5 Enter vector of coefficients

‚í2\‚í 4@@OK@@

—@SYMB@ Generate symbolic expression

` Return to stack.

The expression thus generated is shown in the stack as:

'X^3+5*X^2+-2*X+4'.

To generate the algebraic expression using the roots, try the following example.

Assume that the polynomial roots are [1,3,-2,1]. Use the following keystrokes:

‚Ï˜˜@@OK@@ Select Solve poly…

˜„Ô1‚í3 Enter vector of roots

‚í2\‚í 1@@OK@@

˜@SYMB@ Generate symbolic expression

` Return to stack.

The expression thus generated is shown in the stack as:'

(X-1)*(X-3)*(X+2)*(X-1)'.

Note: If you want to get a polynomial with real coefficients, but having com-

plex roots, you must include the complex roots in pairs of conjugate numbers.

To illustrate the point, generate a polynomial having the roots [1 (1,2) (1,-

2)]. Verify that the resulting polynomial has only real coefficients. Also, try

generating a polynomial with roots [1 (1,2) (-1,2)], and verify that the result-

ing polynomial will have complex coefficients.

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