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Posted by **julez** on Saturday, October 29, 2011 at 8:12pm.

f(x)=8x^5-4x^3-9x^2-9;[1,2]

- algebra -
**drwls**, Saturday, October 29, 2011 at 8:51pmCalculate f(x) at x = 1 and 2, and see if it changes sign between those two points.