Question 1189470
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I just gave crystally clear discussion and the solution to this problem under the link


<A HREF=https://www.algebra.com/algebra/homework/Polynomials-and-rational-expressions/Polynomials-and-rational-expressions.faq.question.1189314.html>https://www.algebra.com/algebra/homework/Polynomials-and-rational-expressions/Polynomials-and-rational-expressions.faq.question.1189314.html</A>


https://www.algebra.com/algebra/homework/Polynomials-and-rational-expressions/Polynomials-and-rational-expressions.faq.question.1189314.html



Don't know what was the need to post it again . . . 



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As presented in the post, &nbsp;the &nbsp;" problem " &nbsp;is mathematically and educationally meaningless.


To be meaningful, &nbsp;it should be re-edited.


The right formulation is &nbsp;THIS :


<pre>
    A function 𝑓(𝑥) = 𝑥^3 + 2𝑥 − 1 has a zero within (0,1). Find the interval <U>where</U> zero exists, if you only have
    a calculator, which allows you to calculate the values of the function in given points, and nothing else.
    (A) (0.1, 0.3) (B) (0.4, 0.5) (C) (0.6, 0.7) (D) (0.7, 0.9) (E) none of the above.
</pre>

I am &nbsp;99% &nbsp;sure that somewhen in the past this problem existed &nbsp;(and was created) &nbsp;in this my last formulation,

but after that it was copy-pasted many times from one web-site to another by people who did not understand its meaning,

(by mathematically incompetent people) &nbsp;and, &nbsp;as a result of such activity in the &nbsp;Internet, &nbsp;the meaning was lost irrevocably.