Limit of Fraction: x→1 (sqrt(x)−x2)/(1−sqrt(x))

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    Fraction Limit
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Homework Help Overview

The discussion revolves around evaluating the limit of the function (sqrt(x)−x²)/(1−sqrt(x)) as x approaches 1. Participants are exploring the behavior of this limit and questioning its potential value.

Discussion Character

  • Exploratory, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • The original poster questions whether the limit could be -2 and expresses uncertainty about the evaluation process. Some participants suggest factoring and simplifying the expression, while others propose a substitution to facilitate the limit calculation.

Discussion Status

Participants are actively engaging with the problem, with some providing guidance on factoring and substitution methods. There is a collaborative effort to clarify the steps involved in evaluating the limit, though no consensus on the final value has been reached.

Contextual Notes

Some participants express difficulty with specific algebraic manipulations, such as factoring cubic expressions, indicating a potential gap in foundational knowledge that may affect their ability to proceed.

nejnadusho
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Hi guys I have a question?


lim x->1 (sqrt(x)-x^2)/(1-sqrt(x))

What is the value of the limit of this function?

Is it possible to be (-2)?

Or I AM WRONG?

Thank you in advance.
 
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… just divide …

nejnadusho said:
(sqrt(x)-x^2)/(1-sqrt(x))

Hi nejnadusho! :smile:

The bottom of this fraction actually factors the top, so you can just divide it out, if you want … :smile:
 
??

I am sorry I cannot do it.

I don't know how to do it
 
Last edited:
It might help to let [itex]\sqrt{x} = u[/itex] so that it becomes

[tex]\frac{u-u^4}{1-u} = \frac{ u(u^3-1)}{u-1}[/tex]

Do you know how to factorize the u^3 -1 term?
 
Thank you nOW I got it.

No I don't know how to factorize this kind of terms
 
[tex]a^3-b^3 = (a-b)(a^2+ab+b^2)[/tex]
Can you proceed?
 
Yes thanks
 

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