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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)(-8x^(14)+16 x+x^(8)))/(9x^(4)+9x)
Answer:

Determine the following limit in simplest form. If the limit is infinite, state that the limit does not exist (DNE).\newlinelimx8x14+16x+x839x4+9x \lim _{x \rightarrow \infty} \frac{\sqrt[3]{-8 x^{14}+16 x+x^{8}}}{9 x^{4}+9 x} \newlineAnswer:

Full solution

Q. Determine the following limit in simplest form. If the limit is infinite, state that the limit does not exist (DNE).\newlinelimx8x14+16x+x839x4+9x \lim _{x \rightarrow \infty} \frac{\sqrt[3]{-8 x^{14}+16 x+x^{8}}}{9 x^{4}+9 x} \newlineAnswer:
  1. Identify highest power: We are given the limit expression:\newlinelimx(8x14+16x+x83)/(9x4+9x)\lim_{x \to \infty}(\sqrt[3]{-8x^{14} + 16x + x^{8}})/(9x^{4} + 9x)\newlineTo simplify this limit, we will first identify the highest power of xx in the numerator and the denominator.
  2. Divide by x4x^4: The highest power of xx in the numerator inside the cube root is x14x^{14}, and the highest power of xx in the denominator is x4x^{4}. To simplify the limit, we will divide both the numerator and the denominator by x4x^{4}, the highest power in the denominator.
  3. Factor out x4x^4: We rewrite the limit expression by factoring out x4x^{4} from the denominator and x12x^{12} (which is (x4)3(x^{4})^3) from the numerator inside the cube root:\newlinelimx(x12(8x2+16x10+1x4)3)/(x4(9+9x3))\lim_{x \to \infty}\left(\sqrt[3]{x^{12}(-8x^{2} + \frac{16}{x^{10}} + \frac{1}{x^{4}})}\right)/\left(x^{4}(9 + \frac{9}{x^{3}})\right)
  4. Simplify inside cube root: Now we simplify the expression inside the cube root by dividing each term by x12x^{12}:\newlinelimx(8+16x22+1x163)/(9+9x3)\lim_{x \to \infty}\left(\sqrt[3]{-8 + \frac{16}{x^{22}} + \frac{1}{x^{16}}}\right)/\left(9 + \frac{9}{x^{3}}\right)
  5. Ignore terms approaching zero: As xx approaches infinity, the terms 16x22\frac{16}{x^{22}}, 1x16\frac{1}{x^{16}}, and 9x3\frac{9}{x^{3}} will approach zero. Therefore, we can ignore these terms for the limit calculation: limx(893)\lim_{x \to \infty}(\sqrt[3]{\frac{-8}{9}})
  6. Calculate cube root: The cube root of 8-8 is 2-2, so the limit simplifies to:\newlinelimx29\lim_{x \to \infty}\frac{-2}{9}
  7. Simplify constant limit: Since 29-\frac{2}{9} is a constant, the limit as xx approaches infinity is simply: 29-\frac{2}{9}

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