The problem asks us to find the vertical asymptote of the function $f(x) = \frac{2x}{x+3}$, and to determine the sign of infinity that $f(x)$ approaches as $x$ approaches the asymptote from the right.

AnalysisLimitsAsymptotesRational FunctionsCalculus
2025/4/23

1. Problem Description

The problem asks us to find the vertical asymptote of the function f(x)=2xx+3f(x) = \frac{2x}{x+3}, and to determine the sign of infinity that f(x)f(x) approaches as xx approaches the asymptote from the right.

2. Solution Steps

First, we find the vertical asymptote. Vertical asymptotes occur where the denominator of a rational function is equal to zero.
x+3=0x + 3 = 0
x=3x = -3
So the vertical asymptote is x=3x = -3.
Next, we need to determine the sign of infinity as xx approaches 3-3 from the right (i.e., x3+x \to -3^+). We can choose a value slightly greater than 3-3, for example x=2.9x = -2.9.
f(2.9)=2(2.9)2.9+3=5.80.1=58f(-2.9) = \frac{2(-2.9)}{-2.9 + 3} = \frac{-5.8}{0.1} = -58.
We can also consider the limit as xx approaches 3-3 from the right:
limx3+2xx+3\lim_{x \to -3^+} \frac{2x}{x+3}.
As xx approaches 3-3 from the right, xx is slightly larger than 3-3, so x+3x+3 approaches 00 from the positive side (i.e., x+30+x+3 \to 0^+).
2x2x approaches 2(3)=62(-3) = -6.
Therefore, limx3+2xx+3=60+=\lim_{x \to -3^+} \frac{2x}{x+3} = \frac{-6}{0^+} = -\infty.

3. Final Answer

The equation of the vertical asymptote is x=3x = -3. As xx approaches the asymptote from the right, the function approaches negative infinity.

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