How to round in this situation

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SUMMARY

The discussion centers on the mathematical concepts of limits and rounding in the context of finding intersections of curves. Specifically, the equations y=1 and y=4+x-3x³ are analyzed to determine their points of intersection, leading to the equation 3x³-x-3=0. The participants clarify that "epsilon" is typically a given value in limit definitions, not something to be found, and emphasize that rounding is not applicable when determining limits. The conversation concludes that the intersections of the curves do not yield rational roots, further negating the need for rounding.

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realism877
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I'm finding epsilon.

This is the precise definition of a limit.

Y=1,y=4+x-3(x)3(3 is to the third power), and y=3

When I find where they intersect, which delta do I round. Is there a rule to rounding in these problems?
 
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I have no idea what you are talking about. There is no "definition of a limit" in what you wrote. In the standard definition of limit, "epsilon" is given, not found. What curves are you talking about intersecting? To find the intersections of y= 1 and y= 4+ x- 3x^3, solve 4+ x- 3x^3= 1 which is the same as solving 3x^3- x- 3= 0. To find the intersections of y= 3 and y= 4+ x- 3x^3, solve 3x^3- x- 1= 0.

Those will not have rational roots. Is that what you are talking about "rounding"? There is no "rounding" in finding limits.
 

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