Howell Ortega
08/10/2024 · Senior High School
Given \( \lim _{x \rightarrow 0^{-}} f(x)=L_{1}, \lim _{x \rightarrow 0^{+}} f(x)=L_{2} \), and \( L_{1}=L_{2} \), which of the following statements is FAL SE? I. \( \lim _{x \rightarrow 0} f(x)=L_{1} \) II. \( \lim _{x \rightarrow 0} f(x)=L_{2} \) III \( \lim _{x \rightarrow 0} f(x) \) does not exist.
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Step-by-step Solution
To analyze the statements given the conditions \( \lim _{x \rightarrow 0^{-}} f(x)=L_{1} \), \( \lim _{x \rightarrow 0^{+}} f(x)=L_{2} \), and \( L_{1}=L_{2} \), we can use the definition of the limit.
Since both one-sided limits exist and are equal (i.e., \( L_{1} = L_{2} \)), we can conclude that the two-sided limit exists and is equal to that common value. Therefore, we can state:
\[
\lim_{x \rightarrow 0} f(x) = L_{1} = L_{2}
\]
Now, let's evaluate each statement:
I. \( \lim _{x \rightarrow 0} f(x)=L_{1} \)
This statement is true because we have established that the limit exists and equals \( L_{1} \).
II. \( \lim _{x \rightarrow 0} f(x)=L_{2} \)
This statement is also true for the same reason; the limit exists and equals \( L_{2} \), which is equal to \( L_{1} \).
III. \( \lim _{x \rightarrow 0} f(x) \) does not exist.
This statement is false because we have shown that the limit does exist and is equal to \( L_{1} \) (and \( L_{2} \)).
Thus, the false statement among the options is:
**III. \( \lim _{x \rightarrow 0} f(x) \) does not exist.**
Quick Answer
The false statement is III. \( \lim _{x \rightarrow 0} f(x) \) does not exist.
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