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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)(27x^(12)-23x^(8)))/(6x^(3)+9)
Answer:

Determine the following limit in simplest form. If the limit is infinite, state that the limit does not exist (DNE).\newlinelimx27x1223x836x3+9 \lim _{x \rightarrow \infty} \frac{\sqrt[3]{27 x^{12}-23 x^{8}}}{6 x^{3}+9} \newlineAnswer:

Full solution

Q. Determine the following limit in simplest form. If the limit is infinite, state that the limit does not exist (DNE).\newlinelimx27x1223x836x3+9 \lim _{x \rightarrow \infty} \frac{\sqrt[3]{27 x^{12}-23 x^{8}}}{6 x^{3}+9} \newlineAnswer:
  1. Identify Powers of x: Identify the highest power of xx in both the numerator and the denominator.\newlineIn the numerator, the highest power of xx inside the cube root is x12x^{12}, and in the denominator, the highest power of xx is x3x^3.
  2. Factor Out Highest Power: Factor out the highest power of xx from the cube root in the numerator.\newlineSince the highest power of xx inside the cube root is x12x^{12}, we can factor out x4x^4 from the cube root (because (x4)3=x12(x^4)^3 = x^{12}).\newlineThe expression becomes:\newlinelimx(x12(2723/x4)3)/(6x3+9)\lim_{x \rightarrow \infty}(\sqrt[3]{x^{12}(27-23/x^4)})/(6x^3+9)
  3. Simplify Cube Root: Simplify the cube root in the numerator.\newlineThe cube root of x12x^{12} is x4x^4, so the expression simplifies to:\newlinelimx(x42723x436x3+9)\lim_{x \to \infty}\left(\frac{x^4 \cdot \sqrt[3]{27-\frac{23}{x^4}}}{6x^3+9}\right)
  4. Divide by x3x^3: Divide every term by x3x^3, the highest power of xx in the denominator.\newlineThis gives us:\newlinelimx(x4x32723x43)/(6+9x3)\lim_{x \to \infty}\left(\frac{x^4}{x^3} \cdot \sqrt[3]{27-\frac{23}{x^4}}\right)/\left(6+\frac{9}{x^3}\right)
  5. Cancel x3x^3 in Numerator: Simplify the expression by canceling out x3x^3 from x4x^4 in the numerator.\newlineThis simplifies to:\newlinelimx(x2723x436+9x3)\lim_{x \to \infty}\left(\frac{x \cdot \sqrt[3]{27-\frac{23}{x^4}}}{6+\frac{9}{x^3}}\right)
  6. Evaluate Limit at Infinity: Evaluate the limit as xx approaches infinity. As xx approaches infinity, 23x4\frac{23}{x^4} approaches 00 and 9x3\frac{9}{x^3} approaches 00. The expression simplifies to: limx(x2736)\lim_{x \to \infty}(\frac{x \cdot \sqrt[3]{27}}{6})
  7. Calculate Cube Root: Calculate the cube root of 2727 and simplify the expression.\newlineThe cube root of 2727 is 33, so the expression simplifies to:\newlinelimx3x6\lim_{x \to \infty}\frac{3x}{6}
  8. Divide by 66: Simplify the expression by dividing 3x3x by 66. This simplifies to: limx(x2)\lim_{x \rightarrow \infty}\left(\frac{x}{2}\right)
  9. Evaluate Limit at Infinity: Evaluate the limit as xx approaches infinity. As xx approaches infinity, x2\frac{x}{2} also approaches infinity. Therefore, the limit does not exist (DNE).

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