Differentiation in Real Functions: Solving for a Differentiable Function

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SUMMARY

The discussion centers on the existence of a differentiable real function defined by the equation (f(x))^5 + f(x) + x = 0. Participants clarify that (f(x))^5 refers to the fifth power of the function, not its fifth derivative. The definition of the derivative is provided as lim (as x -> a) [f(x) - f(a)]/x-a, which is essential for understanding the problem. The conversation emphasizes the need for precise terminology to avoid confusion in solving the equation.

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Homework Statement



Show that there exists a differentiable real function:

(f(x))^5 + f(x) + x = 0

Homework Equations


??
definition of the derivative: lim (as x -> a) [f(x) - f(a)]/x-a

The Attempt at a Solution



Not really sure where to start with this one. any help would be appreciated.
 
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By (f(x))^5, did you mean the fifth power [itex]f^5(x) = (f(x))^5[/tex] or the fifth derivative [itex]f^{(5)}(x) = \frac{d^5f(x)}{dx^5}[/itex]. In the first case it's not a differential equation at all and I don't see why you need the definition for derivative. <br /> <br /> Please clarify what you mean exactly, and we'll give you a push in the right direction.[/itex]
 

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