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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)(-50x^(6)+4+27x^(12)))/(x^(4)+4x^(2))
Answer:

Determine the following limit in simplest form. If the limit is infinite, state that the limit does not exist (DNE).\newlinelimx50x6+4+27x123x4+4x2 \lim _{x \rightarrow \infty} \frac{\sqrt[3]{-50 x^{6}+4+27 x^{12}}}{x^{4}+4 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).\newlinelimx50x6+4+27x123x4+4x2 \lim _{x \rightarrow \infty} \frac{\sqrt[3]{-50 x^{6}+4+27 x^{12}}}{x^{4}+4 x^{2}} \newlineAnswer:
  1. Observe Highest Powers: To find the limit of the given expression as xx approaches infinity, we first observe the highest powers of xx in the numerator and the denominator. In the numerator, the highest power is x12x^{12} inside the cube root, which simplifies to x4x^4 outside the cube root. In the denominator, the highest power is x4x^4. We will divide both the numerator and the denominator by x4x^4 to simplify the expression.
  2. Divide by x4x^4: Divide each term in the numerator and the denominator by x4x^4:limx(50x6x4+4x4+27x12x43)/(x4x4+4x2x4)\lim_{x \to \infty}\left(\sqrt[3]{\frac{-50x^{6}}{x^{4}} + \frac{4}{x^{4}} + \frac{27x^{12}}{x^{4}}}\right)/\left(\frac{x^{4}}{x^{4}} + \frac{4x^{2}}{x^{4}}\right)Simplify the expression:limx(50x2+4x4+27x83)/(1+4x2)\lim_{x \to \infty}\left(\sqrt[3]{-50x^{2} + \frac{4}{x^{4}} + 27x^{8}}\right)/\left(1 + \frac{4}{x^{2}}\right)
  3. Simplify Expression: As xx approaches infinity, the terms with negative powers of xx will approach zero. Therefore, 4x4\frac{4}{x^{4}} in the numerator and 4x2\frac{4}{x^{2}} in the denominator will become negligible:\newlinelimx(50x2+0+27x83)/(1+0)\lim_{x \rightarrow \infty}(\sqrt[3]{-50x^{2} + 0 + 27x^{8}})/(1 + 0)\newlineSimplify the expression further:\newlinelimx(27x850x23)/1\lim_{x \rightarrow \infty}(\sqrt[3]{27x^{8} - 50x^{2}})/1
  4. Approaching Infinity: Now, we can take the cube root of the terms inside the root separately since the limit of a sum is the sum of the limits:\newlinelimx(27x8350x23)\lim_{x \rightarrow \infty}(\sqrt[3]{27x^{8}} - \sqrt[3]{50x^{2}})\newlineSimplify the cube roots:\newlinelimx(3x83(50)13x23)\lim_{x \rightarrow \infty}(3x^{\frac{8}{3}} - (50)^{\frac{1}{3}}x^{\frac{2}{3}})
  5. Take Cube Roots: As xx approaches infinity, the term with the higher power of xx will dominate. In this case, 3x8/33x^{8/3} will grow much faster than (50)1/3x2/3(50)^{1/3}x^{2/3}, so the latter term becomes negligible:\newlinelimx(3x8/3)\lim_{x \to \infty}(3x^{8/3})
  6. Dominant Term: The limit of 3x833x^{\frac{8}{3}} as xx approaches infinity is infinity since the power of xx is positive:\newlinelimx(3x83)=\lim_{x \to \infty}(3x^{\frac{8}{3}}) = \infty\newlineTherefore, the limit does not exist (DNE).