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Determine the following limit in simplest form. If the limit is infinite, state that the limit does not exist (DNE).

lim_(x rarr oo)(sqrt(-19x^(3)+36x^(4)))/(3+x+x^(2))
Answer:

Determine the following limit in simplest form. If the limit is infinite, state that the limit does not exist (DNE).\newlinelimx19x3+36x43+x+x2 \lim _{x \rightarrow \infty} \frac{\sqrt{-19 x^{3}+36 x^{4}}}{3+x+x^{2}} \newlineAnswer:

Full solution

Q. Determine the following limit in simplest form. If the limit is infinite, state that the limit does not exist (DNE).\newlinelimx19x3+36x43+x+x2 \lim _{x \rightarrow \infty} \frac{\sqrt{-19 x^{3}+36 x^{4}}}{3+x+x^{2}} \newlineAnswer:
  1. Analyze Behavior of Functions: To find the limit of the function as xx approaches infinity, we need to analyze the behavior of the numerator and the denominator separately. We will start by simplifying the function, focusing on the highest power of xx in both the numerator and the denominator.
  2. Simplify Numerator: In the numerator, we have a square root of a polynomial. The highest power of xx inside the square root is x4x^4, so we can factor out x2x^2 from the square root to simplify the expression.\newline19x3+36x4=x219x+36\sqrt{-19x^{3}+36x^{4}} = x^2 \cdot \sqrt{-\frac{19}{x} + 36}
  3. Focus on Denominator: In the denominator, the highest power of xx is x2x^2. As xx approaches infinity, the lower powers of xx (33 and xx) become insignificant compared to x2x^2. Therefore, we can focus on x2x^2 in the denominator.\newline3+x+x2x23 + x + x^2 \approx x^2
  4. Rewrite Original Function: Now we rewrite the original function, focusing on the dominant terms: 19x3+36x43+x+x2x219x+36x2\frac{\sqrt{-19x^{3}+36x^{4}}}{3+x+x^{2}} \approx \frac{x^2 \sqrt{-\frac{19}{x} + 36}}{x^2}
  5. Simplify x2x^2 Terms: We can now simplify the x2x^2 terms in the numerator and the denominator: x219x+36x219x+36\frac{x^2 \sqrt{-\frac{19}{x} + 36}}{x^2} \approx \sqrt{-\frac{19}{x} + 36}
  6. Further Simplification: As xx approaches infinity, the term 19x-\frac{19}{x} approaches 00, so we can simplify the expression inside the square root further: 19x+3636\sqrt{-\frac{19}{x} + 36} \approx \sqrt{36}
  7. Final Limit Calculation: The square root of 3636 is 66, so the limit of the function as xx approaches infinity is 66.

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