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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)(root(3)(31-27x^(6)))/(7+8x+3x^(2))
Answer:

Determine the following limit in simplest form. If the limit is infinite, state that the limit does not exist (DNE).\newlinelimx3127x637+8x+3x2 \lim _{x \rightarrow \infty} \frac{\sqrt[3]{31-27 x^{6}}}{7+8 x+3 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).\newlinelimx3127x637+8x+3x2 \lim _{x \rightarrow \infty} \frac{\sqrt[3]{31-27 x^{6}}}{7+8 x+3 x^{2}} \newlineAnswer:
  1. Analyze Behavior: We are asked to find the limit of the function 3127x637+8x+3x2\frac{\sqrt[3]{31-27x^{6}}}{7+8x+3x^{2}} as xx approaches infinity. To do this, we will analyze the behavior of the numerator and the denominator separately as xx grows without bound.
  2. Consider Highest Powers: First, let's consider the highest power of xx in the numerator and the denominator. In the numerator, the highest power inside the cube root is x6x^6, and in the denominator, the highest power is x2x^2. To simplify the limit, we will divide both the numerator and the denominator by x2x^2, the highest power in the denominator.
  3. Divide by x2x^2: Dividing the numerator by x2x^2 inside the cube root gives us 31x227x43\sqrt[3]{\frac{31}{x^2} - 27x^4}. Dividing the denominator by x2x^2 gives us 7x2+8x+3\frac{7}{x^2} + \frac{8}{x} + 3.
  4. Simplify Numerator: As xx approaches infinity, the terms 31x2\frac{31}{x^2} in the numerator and 7x2\frac{7}{x^2} and 8x\frac{8}{x} in the denominator approach 00. So, we can simplify the limit to the leading terms, which gives us the limit of 27x433\frac{\sqrt[3]{-27x^4}}{3} as xx approaches infinity.
  5. Take Cube Root: Now, we can take the cube root of 27x4-27x^4, which simplifies to 3x4/3-3x^{4/3}. The limit now becomes the limit of 3x4/33\frac{-3x^{4/3}}{3} as xx approaches infinity.
  6. Divide by 33: We can simplify the expression further by dividing 3x43-3x^{\frac{4}{3}} by 33, which gives us x43-x^{\frac{4}{3}}. So, the limit we are trying to find is now the limit of x43-x^{\frac{4}{3}} as xx approaches infinity.
  7. Simplify Further: Since x43x^{\frac{4}{3}} grows without bound as xx approaches infinity, the limit of x43-x^{\frac{4}{3}} is negative infinity. Therefore, the limit does not exist.

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