Posted by **ted** on Thursday, July 5, 2012 at 10:47pm.

how do you factor X^3+X^2-9X-9

pls help. I don't know what to do

- math -
**Reiny**, Thursday, July 5, 2012 at 11:02pm
looks like grouping might be the simplest way ...

X^3+X^2-9X-9

= x^2(x+1) - 9(x+1)

= (x+1)(x^2-9) and now I see a difference of squares

= (x+1)(x+1)(x-1)

or

= (x-1)(x+1)^2

- math -
**Steve**, Friday, July 6, 2012 at 10:01am
or, noting the "9" :-)

(x-1)(x-3)(x+3)

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