Posted by **Anonymous** on Tuesday, June 8, 2010 at 8:39pm.

f(x) = x3 + 2x2 – 0.4X – 1

how do you you factor this?

- Math 209 -
**Reiny**, Tuesday, June 8, 2010 at 8:49pm
Do not repost a question which has been answered.

http://www.jiskha.com/display.cgi?id=1276043019

- Math 209 -
**drwls**, Tuesday, June 8, 2010 at 8:54pm
Please use ^ before exponents.

There is no simpl standard formula for finding the roots of cubic equations. First create integer coefficients by rewriting as

(1/5) (5x^3 + 10x^2 -2x -5)

There are no simple factors with integers for this equation. That can be proven with something sometimes called the "p/q theorem". It can be faotored to

f(x) = 5[(x-0.689)(x+1.941,(x+0.748)]

I used an online solver for that.

The numbers in the factors are rounded.

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