I have and am trying to solve , that is
Last edited by mr fantastic; Sep 23rd 2010 at 03:55 PM. Reason: Heavily edited for clarity. Re-titled.
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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 ?
Originally Posted by Unknown008 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 ? Yeah, I need to find x. But I think that pulling 4x out is wrong. <------ isn't that illegal or something?
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
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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