Originally Posted by

**Pankie** In Canada, hundreds of thousands of Cubic metres of wood are harvested each year. The function

f(x)=1135x^4-8197x^3+15868x^2-2157x+176608 0<=x<=4

models the harvested volume from 1993 to 1997

Estimate the interval when less than 185000m^3 were harvested.

So I setup the equation being <185000

I brought the 185000 over and ended up with

1135x^4-8197x^3+15868x^2-2157x-8392<0

I can't find a factor using factor theorum, maybe i'm not trying hard enough but i've spent quite a bit on it. Could anyone assist?