I have

and am trying to solve

, that is

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- September 23rd 2010, 11:59 AMdensitySolving a cubic equation.
I have

and am trying to solve

, that is - September 23rd 2010, 12:03 PMUnknown008
The common factor is 4x. Can you try to factor it?

Either that, or I'm not understanding what you need to do.

Do you need to find the values of x for which 4x^3 + 4x = 1 ? - September 23rd 2010, 12:10 PMdensity
- September 23rd 2010, 12:20 PMe^(i*pi)
Indeed, you can't do that

You get

There aren't any rational factors though

From wolfram: http://www.wolframalpha.com/input/?i=4x^3%2B4x-1+%3D+0 - September 23rd 2010, 12:28 PMUnknown008
Ok, no, that's not possible.

Bring all the terms on the same side.

However, this doesn't seem to have three real roots.

So, we'll go by iteration.

Set one x as subject of formula.

Lets take... x = 0.5

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.

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