I've got this here . . . x^3 +7x -1 = 0.

I know it equals x = 0.142 approx, but I found that out by graphing it. I'm stumped as to how to solve it algebraically. (Headbang)

Any help is much appreciated.

Thanks!

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- Mar 26th 2013, 04:03 PMncpennFinding zeros of a polynominal that doesn't factor (and whose zeros are non-integers)
I've got this here . . . x^3 +7x -1 = 0.

I know it equals x = 0.142 approx, but I found that out by graphing it. I'm stumped as to how to solve it algebraically. (Headbang)

Any help is much appreciated.

Thanks! - Mar 26th 2013, 04:49 PMBeanRe: Finding zeros of a polynominal that doesn't factor (and whose zeros are non-integ
Wikipedia has a pretty comprehensive article regarding how to solve a cubic algebraically.

Cubic function - Wikipedia, the free encyclopedia - Mar 26th 2013, 06:20 PMProve ItRe: Finding zeros of a polynominal that doesn't factor (and whose zeros are non-integ
You should use a numerical method. Otherwise use the Cubic Formula if you really feel adventurous...

- Mar 27th 2013, 10:50 AMjoeDITRe: Finding zeros of a polynominal that doesn't factor (and whose zeros are non-integ
Yea I'd go with what Prove it said above and that wiki article should help alot. if it helps at all your looking for 3 roots and two of them are complex roots.