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Analyze the function f(x) = (e^x)/(x+2): find its domain and limits at the boundaries of the domain.

Mathematics

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Answer

a

R∖{−2}\mathbb{R} \setminus \{-2\}

Graph of f(x) = e^x/(x + 2)

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Key points of f(x) = e^x/(x + 2)
Pointxy
Minimum−10.37
y-intercept00.5

Here's a detailed analysis of the function f(x)=exx+2f(x) = \frac{e^x}{x+2}.

a) The domain of f(x)f(x)
The function f(x)f(x) is defined for all real numbers where the denominator is not zero.
The denominator is x+2x+2.
Setting the denominator to zero:

x+2=0x+2 = 0 x=−2x = -2

Thus, the function is defined for all real numbers except x=−2x=-2.
The domain is R∖{−2}\boxed{\mathbb{R} \setminus \{-2\}}.

b) The limits at the boundaries of the domain
The boundaries of the domain are x→−∞x \to -\infty, x→−2−x \to -2^-, x→−2+x \to -2^+, and x→∞x \to \infty.

  1. As x→−∞x \to -\infty:

    lim⁡x→−∞f(x)=lim⁡x→−∞exx+2\lim_{x \to -\infty} f(x) = \lim_{x \to -\infty} \frac{e^x}{x+2}

    As x→−∞x \to -\infty, ex→0e^x \to 0 and x+2→−∞x+2 \to -\infty.

    lim⁡x→−∞f(x)=0−∞=0\lim_{x \to -\infty} f(x) = \frac{0}{-\infty} = 0
  2. As x→−2−x \to -2^- (from the left side of −2-2):

    lim⁡x→−2−f(x)=lim⁡x→−2−exx+2\lim_{x \to -2^-} f(x) = \lim_{x \to -2^-} \frac{e^x}{x+2}

    As x→−2−x \to -2^-, ex→e−2e^x \to e^{-2} (a positive constant) and x+2→0−x+2 \to 0^- (a small negative number).

    lim⁡x→−2−f(x)=e−20−=−∞\lim_{x \to -2^-} f(x) = \frac{e^{-2}}{0^-} = -\infty
  3. As x→−2+x \to -2^+ (from the right side of

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