Welch Savage
03/17/2023 · Middle School
\( \lim 9 ( x ^ { 2 } - x ) ( \frac { \sqrt { x } + x ^ { 2 } + 3 } { 2 x + \log x } ) = \)
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Tutor-Verified Answer
Step-by-step Solution
To evaluate the limit
\[
\lim_{x \to 0} 9 (x^2 - x) \left( \frac{\sqrt{x} + x^2 + 3}{2x + \log x} \right),
\]
we first analyze the behavior of each component as \( x \to 0 \).
1. **Analyzing \( x^2 - x \)**:
\[
x^2 - x = x(x - 1).
\]
As \( x \to 0 \), \( x^2 - x \to 0 \).
2. **Analyzing \( \sqrt{x} + x^2 + 3 \)**:
\[
\sqrt{x} + x^2 + 3 \to 0 + 0 + 3 = 3 \quad \text{as } x \to 0.
\]
3. **Analyzing \( 2x + \log x \)**:
As \( x \to 0 \), \( \log x \to -\infty \). Therefore,
\[
2x + \log x \to -\infty.
\]
Now, we can combine these results into the limit expression:
\[
\lim_{x \to 0} 9 (x^2 - x) \left( \frac{\sqrt{x} + x^2 + 3}{2x + \log x} \right) = \lim_{x \to 0} 9 (x^2 - x) \left( \frac{3}{2x + \log x} \right).
\]
Next, we substitute the limits we found:
- The numerator approaches \( 3 \) as \( x \to 0 \).
- The denominator approaches \( -\infty \).
Thus, we have:
\[
\lim_{x \to 0} 9 (x^2 - x) \left( \frac{3}{2x + \log x} \right) = \lim_{x \to 0} 9 (x^2 - x) \cdot \frac{3}{-\infty} = 0.
\]
Since \( x^2 - x \to 0 \) and the fraction approaches \( 0 \) as well, we conclude that the entire limit evaluates to:
\[
\boxed{0}.
\]
Quick Answer
The limit evaluates to \( 0 \).
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