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Which statement best describes the limit shown below?

lim_(x rarr oo)(-7ln x)/(3x^(38)+5x^(38))
The limit equals zero
The limit does not exist
The limit exists and does not equal zero

Which statement best describes the limit shown below?\newlinelimx7lnx3x38+5x38 \lim _{x \rightarrow \infty} \frac{-7 \ln x}{3 x^{38}+5 x^{38}} \newlineThe limit equals zero\newlineThe limit does not exist\newlineThe limit exists and does not equal zero

Full solution

Q. Which statement best describes the limit shown below?\newlinelimx7lnx3x38+5x38 \lim _{x \rightarrow \infty} \frac{-7 \ln x}{3 x^{38}+5 x^{38}} \newlineThe limit equals zero\newlineThe limit does not exist\newlineThe limit exists and does not equal zero
  1. Identify Denominator: We are given the limit expression limx(7lnx3x38+5x38)\lim_{x \to \infty}\left(\frac{-7\ln x}{3x^{38}+5x^{38}}\right). To find the limit as xx approaches infinity, we need to analyze the behavior of the numerator and the denominator separately.
  2. Combine Like Terms: First, let's look at the denominator: 3x38+5x383x^{38} + 5x^{38}. We can combine like terms by adding the coefficients of the x38x^{38} terms.\newline3x38+5x38=(3+5)x38=8x38.3x^{38} + 5x^{38} = (3 + 5)x^{38} = 8x^{38}.
  3. Analyze Behavior: Now, we have the limit expression simplified to limx(7lnx8x38)\lim_{x \to \infty}\left(\frac{-7\ln x}{8x^{38}}\right). The next step is to recognize that as xx approaches infinity, the natural logarithm function lnx\ln x grows without bound, but at a much slower rate than any positive power of xx.
  4. Recognize Growth Rates: Since the denominator contains xx raised to the 38th38^{\text{th}} power, it will grow much faster than the natural logarithm in the numerator as xx approaches infinity. This means that the fraction as a whole will approach zero.
  5. Determine Limit: Therefore, the limit of 7lnx8x38\frac{-7\ln x}{8x^{38}} as xx approaches infinity is 00 because the denominator increases much faster than the numerator.

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