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January 28, 2015

January 28, 2015

Posted by **anonymous** on Thursday, January 10, 2013 at 12:48am.

x^3+x^2+64x+64>0

please show work

- math-please help,need quickly -
**drwls**, Thursday, January 10, 2013 at 1:27amLook for roots of

x^3+x^2+64x+64 = 0

among x = +or- 1,2,4,8 and 16

(That is called using the rational rooot theorem)

One of them is x= -1. Therefore (x+1) is a factor of the polynomial.

Now divide x^3+ x^2+ 64x+ 64 by x+1 for the other roots. Between the x values where f(x) = 0, the function is either + or -. You will have to figure that out.

If you can't, try reading

http://www.algebra.com/algebra/homework/Graphs/Graphs.faq.question.516644.html

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