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Find 
lim_(x rarr oo)(5x^(3)+2x^(2)-7)/(x^(4)+3x).
Choose 1 answer:
(A) 0
(B) 5
(C) 
(3)/(4)
(D) The limit is unbounded

Find limx5x3+2x27x4+3x \lim _{x \rightarrow \infty} \frac{5 x^{3}+2 x^{2}-7}{x^{4}+3 x} .\newlineChoose 11 answer:\newline(A) 00\newline(B) 55\newline(C) 34 \frac{3}{4} \newline(D) The limit is unbounded

Full solution

Q. Find limx5x3+2x27x4+3x \lim _{x \rightarrow \infty} \frac{5 x^{3}+2 x^{2}-7}{x^{4}+3 x} .\newlineChoose 11 answer:\newline(A) 00\newline(B) 55\newline(C) 34 \frac{3}{4} \newline(D) The limit is unbounded
  1. Analyze Behavior: To find the limit of the given function as xx approaches infinity, we need to analyze the behavior of the numerator and the denominator separately. We look for the highest power of xx in both the numerator and the denominator to determine the leading terms.
  2. Highest Power Analysis: The highest power of xx in the numerator is x3x^3, and the highest power of xx in the denominator is x4x^4. As xx approaches infinity, the terms with lower powers of xx become insignificant compared to the leading terms. Therefore, we can focus on the leading terms to determine the limit.
  3. Focus on Leading Terms: The leading term in the numerator is 5x35x^3, and the leading term in the denominator is x4x^4. As xx approaches infinity, the ratio of these two terms will determine the limit. The ratio is 5x3x4\frac{5x^3}{x^4}, which simplifies to 5x\frac{5}{x}.
  4. Determine Ratio: As xx approaches infinity, the term 5x\frac{5}{x} approaches 00 because the denominator grows much faster than the numerator. Therefore, the limit of the entire expression as xx approaches infinity is 00.
  5. Limit Calculation: Comparing our result with the given options, we find that the correct answer is (A)0(A) \, 0.

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