x³-2x²-5x+6 / x² - x -6

i tried grouping but it didnt work...... o_o please help (Doh)

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- Oct 19th 2008, 02:43 AMmuffledmathsimplifying rational expressions!! ?
x³-2x²-5x+6 / x² - x -6

i tried grouping but it didnt work...... o_o please help (Doh) - Oct 19th 2008, 03:54 AMticbol
Try long division.

- Oct 19th 2008, 04:19 AMthisisme
Factorise the top and bottom to get: (x-3)(x+2)(x-1)/(x-3)(x+2) then cancel out the like factors.

- Oct 19th 2008, 05:37 AMmuffledmath
where did you get (x-3) ??

- Oct 19th 2008, 05:41 AMvincisonfireReply
If you have a polynomial of form

an * x^n + ... + m then the roots are in the set

±m

----

±n

Here they are ±1 ±2 and ±3.

That's a way to find it. You try them and keep the one that works. - Nov 27th 2012, 03:43 AMedmundyongRe: simplifying rational expressions!! ?
I tried long division and it works. I get (x-1)

- Nov 27th 2012, 06:19 AMskeeterRe: simplifying rational expressions!! ?