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September 21, 2014

September 21, 2014

Posted by **shirley** on Saturday, June 30, 2012 at 9:09pm.

- algebra -
**Reiny**, Sunday, July 1, 2012 at 12:10amcritical values: x = -2, -1, and 11

pick any number <-2, say x=-5

(-)(-)(-) > 0 ? NO

pick any number between -2 and -1, say x = -1.5

(+)(-)(-) > 0 ? YES

pick any number between -1 and 11 , say x=0

(+)(-)(=) > 0 ? , NO

pick any number > 11 , say x=20

(+)(+)(+) > 0 ?, YES

so

-2 < x < -1 OR x > 11

OR

look at the graph of y = (x+2)(x-11)(x+1)

and the above solution is obvious.

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