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January 27, 2015

January 27, 2015

Posted by **M** on Thursday, September 22, 2011 at 8:28pm.

f(x) = x^5 - 5x^4 +8x + 2

- pre calculus -
**Steve**, Friday, September 23, 2011 at 1:40pmCheck your notes for the technique of using synthetic division to find upper/lower bounds on roots.

If f(x)/(x-c) has all positive coefficients and c>0, c is an upper bound.

If f(x)/(x-c) has alternating coefficients and c<0, c is a lower bound

A little trial and error shows that

5 is an upper bound and -1 is a lower bound

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