Parsons Tucker
03/15/2024 · Elementary School
If \( f(x) = 3x - x^2 \), squeeze it between two functions to determine \( \lim_{x \to 1} f(x) \).
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Step-by-step Solution
To find the limit \( \lim_{x \to 1} f(x) \) where \( f(x) = 3x - x^2 \), we can first evaluate \( f(1) \):
\[
f(1) = 3(1) - (1)^2 = 3 - 1 = 2.
\]
Now, we will use the Squeeze Theorem to confirm this limit. To do this, we need to find two functions that bound \( f(x) \) as \( x \) approaches 1.
First, we can rewrite \( f(x) \):
\[
f(x) = 3x - x^2 = -x^2 + 3x.
\]
Next, we can factor \( f(x) \):
\[
f(x) = - (x^2 - 3x) = - (x(x - 3)).
\]
To find bounds for \( f(x) \), we can analyze the behavior of \( f(x) \) around \( x = 1 \). We can evaluate \( f(x) \) at points close to 1:
1. For \( x = 0.5 \):
\[
f(0.5) = 3(0.5) - (0.5)^2 = 1.5 - 0.25 = 1.25.
\]
2. For \( x = 1.5 \):
\[
f(1.5) = 3(1.5) - (1.5)^2 = 4.5 - 2.25 = 2.25.
\]
From these evaluations, we see that \( f(x) \) is increasing in the interval around \( x = 1 \).
Now, we can establish bounds for \( f(x) \) as \( x \) approaches 1. We can observe that:
\[
f(x) \text{ is continuous at } x = 1.
\]
Thus, we can use the fact that \( f(x) \) is continuous to apply the Squeeze Theorem. Since \( f(1) = 2 \) and \( f(x) \) is continuous, we can conclude:
\[
\lim_{x \to 1} f(x) = f(1) = 2.
\]
Therefore, the limit is:
\[
\boxed{2}.
\]
Quick Answer
The limit \( \lim_{x \to 1} f(x) \) is 2.
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