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January 31, 2015

January 31, 2015

Posted by **vince** on Wednesday, September 26, 2007 at 1:05am.

x3-5x2-14x>0

- algeb collage -
**drwls**, Wednesday, September 26, 2007 at 1:18amFirst factor it and rewrite as

x (x-7)(x+2) > 0

The function crosses the y axis at x = -2, x=0 and x=7

When x<-2 all three factors are negative, so the function is <0 there

The -2<x<0, two factors are negative and one is postive, so the inequality is satisfied.

Cosider also the regions 0<x<7 and x>7 and figure out if the fucntiuon is postive or negative there.

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