Solving Polynomials on a TI-89 Calculator

[Motox7]

okay, so i know how to factor( and the expand(

but i have a question for dividing polynomials such as...

9x^5-6x^3+x-63 / x-8

how do i enter this into my calculatoor?! AHH its driving me INSANEEEEEEEEEe

i get 9x^5-6x^3+x-63/x-8 but my teacher gets a different everytime for every problem similar to this...ahhh.

what do i dooooooo

 

[d_leet]

Enter it into your calculator as (9x^5-6x^3+x-63)/(x-8), but you could always just do the division yourself instead of on your calculator.

 

[ranger]

Use propFrac() located in the algebra menu.

https://www.physicsforums.com/showpost.php?p=1206705&postcount=14

 

[SnipedYou]

Personally I think it is easier and quicker to synthetically divide then to waste my time plugging it into a calculator.

If you don't know what synthetic division is, you can read about it at the bottom of this page.

http://www.purplemath.com/modules/remaindr.htm

 

[robert Ihnot]

ranger: Use propFrac() located in the algebra menu.


The TI-89 is often difficult (awkward) to use. The problem here is that 8 is not a root of the polynomial. Ranger hit the nail on the head. As for the Algebra menu, it's sort of hidden under the Math menu being the ninth function.

 

[rs1n]

okay, so i know how to factor( and the expand(

but i have a question for dividing polynomials such as...

9x^5-6x^3+x-63 / x-8

how do i enter this into my calculatoor?! AHH its driving me INSANEEEEEEEEEe

i get 9x^5-6x^3+x-63/x-8 but my teacher gets a different everytime for every problem similar to this...ahhh.

what do i dooooooo

The problem is with the order of operations:

9x^5-6x^3+x-63 / x-8

gets treated as:

9x^5-6x^3+x- (63/x) -8

Presumably you meant (9x^5-6x^3+x-63)/(x-8); as d_leet suggested, enter it exactly in this form.