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Ribcakes
Joined: 26 Mar 2008
Posts: 3
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 Posted: March 27, 2008 11:58 AM Post subject: quadratic factoring |
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i just go t a new TI-89 and am in the process of essentially re-writing my old programs from the TI-84
i was taking advantage of the "factor ()"
the code that is having the problem is:
| Code: |
ElseIf bol=3 Then
Disp a,b,c
disp factor( ax^2 + bx+c)
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the disp a,b,c lines works and displays the numbers stored as a b and c
that is probably not the right way to show the factorization of that
i continue to get an "undefined variable" error
if someone could either offer advice or a better way to work this it would be most appreciated
thank you
--Rib |
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eboccuzzi
Joined: 29 Jul 2008
Posts: 4
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| Posted: July 29, 2008 3:37 PM Post subject: quadratic factoring |
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If I understand your inquiry, you want to use the TI-89 to factor a quadratic expression, such as x^2 + 4x + 4.
The TI-89 has a built in function:
Choose F2
2 Factor
Enter the quadratic
Close parentheses
Enter
The 89 factors the above to (x +2)^2.
Sorry if this doesn't answer your question.
Good luck.
Ed |
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calc0002
Joined: 01 Oct 2008
Posts: 4
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| Posted: October 3, 2008 9:36 AM Post subject: Re: quadratic factoring |
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| Ribcakes wrote: | i just go t a new TI-89 and am in the process of essentially re-writing my old programs from the TI-84
i was taking advantage of the "factor ()"
the code that is having the problem is:
| Code: |
ElseIf bol=3 Then
Disp a,b,c
disp factor( ax^2 + bx+c)
|
the disp a,b,c lines works and displays the numbers stored as a b and c
that is probably not the right way to show the factorization of that
i continue to get an "undefined variable" error
if someone could either offer advice or a better way to work this it would be most appreciated
thank you
--Rib |
The TI-89 evaluates the ax^2 as a variable ax squared, not a*(x^2). So change the last line to | Code: | | Disp factor((a*(x^2))+(b*x)+c) |
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