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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)(13x^(3)+47x^(7)+x^(10)))/(7x+3x^(3))
Answer:

Determine the following limit in simplest form. If the limit is infinite, state that the limit does not exist (DNE).\newlinelimx13x3+47x7+x1037x+3x3 \lim _{x \rightarrow \infty} \frac{\sqrt[3]{13 x^{3}+47 x^{7}+x^{10}}}{7 x+3 x^{3}} \newlineAnswer:

Full solution

Q. Determine the following limit in simplest form. If the limit is infinite, state that the limit does not exist (DNE).\newlinelimx13x3+47x7+x1037x+3x3 \lim _{x \rightarrow \infty} \frac{\sqrt[3]{13 x^{3}+47 x^{7}+x^{10}}}{7 x+3 x^{3}} \newlineAnswer:
  1. Identify highest power: To find the limit of the given expression as xx approaches infinity, we should first identify the highest power of xx in both the numerator and the denominator to simplify the expression.
  2. Divide by x3x^{3}: In the numerator, the highest power of xx is x10x^{10} and in the denominator, the highest power of xx is x3x^{3}. To simplify, we can divide both the numerator and the denominator by x3x^{3}, the highest power in the denominator.
  3. Simplify expression: After dividing by x3x^{3}, the expression becomes:\newlinelimx(13x3x3+47x7x3+x10x33)/(7xx3+3x3x3)\lim_{x \rightarrow \infty}\left(\sqrt[3]{\frac{13x^{3}}{x^{3}} + \frac{47x^{7}}{x^{3}} + \frac{x^{10}}{x^{3}}}\right)/\left(\frac{7x}{x^{3}} + \frac{3x^{3}}{x^{3}}\right)\newlineThis simplifies to:\newlinelimx(13+47x4+x73)/(7x2+3)\lim_{x \rightarrow \infty}\left(\sqrt[3]{13 + 47x^{4} + x^{7}}\right)/\left(\frac{7}{x^{2}} + 3\right)
  4. Negligible terms: As xx approaches infinity, the terms 1313 and 33 become negligible compared to the terms with xx. Also, 7x2\frac{7}{x^{2}} approaches 00. So the expression further simplifies to:\newlinelimx(47x4+x73)/3\lim_{x \rightarrow \infty}\left(\sqrt[3]{47x^{4} + x^{7}}\right)/3
  5. Dominant term: Now, we can see that x7x^{7} is the dominant term in the cube root, so we can ignore the 47x447x^{4} term as xx approaches infinity. The expression now simplifies to:\newlinelimx(x73)/3\lim_{x \rightarrow \infty}(\sqrt[3]{x^{7}})/3
  6. Final limit: Taking the cube root of x7x^{7} gives us x73x^{\frac{7}{3}}. So the expression is now:\newlinelimxx733\lim_{x \rightarrow \infty}\frac{x^{\frac{7}{3}}}{3}
  7. Final limit: Taking the cube root of x7x^{7} gives us x73x^{\frac{7}{3}}. So the expression is now:\newlinelimxx733\lim_{x \rightarrow \infty}\frac{x^{\frac{7}{3}}}{3} As xx approaches infinity, x73x^{\frac{7}{3}} also approaches infinity. Therefore, the limit of the expression as xx approaches infinity is infinity.

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