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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)(48x^(5)+x^(6)-39x^(2)))/(10x^(2)+7x^(3))
Answer:

Determine the following limit in simplest form. If the limit is infinite, state that the limit does not exist (DNE).\newlinelimx48x5+x639x2310x2+7x3 \lim _{x \rightarrow \infty} \frac{\sqrt[3]{48 x^{5}+x^{6}-39 x^{2}}}{10 x^{2}+7 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).\newlinelimx48x5+x639x2310x2+7x3 \lim _{x \rightarrow \infty} \frac{\sqrt[3]{48 x^{5}+x^{6}-39 x^{2}}}{10 x^{2}+7 x^{3}} \newlineAnswer:
  1. Simplify expression by factoring: We are given the limit: limx(48x5+x639x2310x2+7x3)\lim_{x \to \infty}\left(\frac{\sqrt[3]{48x^{5}+x^{6}-39x^{2}}}{10x^{2}+7x^{3}}\right) Step 11: Simplify the expression inside the cube root by factoring out the highest power of xx common to all terms.
  2. Focus on highest power terms: Since xx is approaching infinity, we can focus on the terms with the highest power of xx in the numerator and the denominator.\newlineIn the numerator, the term with the highest power of xx is x6x^6, and in the denominator, it is x3x^3.\newlineWe can factor x5x^5 out of the cube root in the numerator to simplify the expression.\newline48x5+x639x23=x5(x+4839/x3)3\sqrt[3]{48x^{5}+x^{6}-39x^{2}} = \sqrt[3]{x^5(x + 48 - 39/x^3)}
  3. Factor out highest power of x: Simplify the expression in the denominator by factoring out the highest power of xx common to all terms.10x2+7x3=x2(10+7x)10x^{2}+7x^{3} = x^2(10 + 7x)
  4. Rewrite limit with simplified expressions: Now we rewrite the limit with the simplified expressions. limx(x5(x+4839x3)3)/(x2(10+7x))\lim_{x \to \infty}\left(\sqrt[3]{x^5(x + 48 - \frac{39}{x^3})}\right)/\left(x^2(10 + 7x)\right)
  5. Divide by x2x^2: We can now divide both the numerator and the denominator by x2x^2.limx(x5(x+4839x3)3x2)/(10+7x)\lim_{x \to \infty}\left(\frac{\sqrt[3]{x^5(x + 48 - \frac{39}{x^3})}}{x^2}\right)/\left(10 + 7x\right)
  6. Simplify expression inside cube root: Simplify the expression inside the cube root by canceling out x2x^2.x5(x+4839x3)x23=x3(x+4839x3)3\sqrt[3]{\frac{x^5(x + 48 - \frac{39}{x^3})}{x^2}} = \sqrt[3]{x^3(x + 48 - \frac{39}{x^3})}
  7. Take xx out of cube root: Since we have a cube root, we can take x3x^3 out of the cube root.x3(x+4839x3)3=xx+4839x33\sqrt[3]{x^3(x + 48 - \frac{39}{x^3})} = x \cdot \sqrt[3]{x + 48 - \frac{39}{x^3}}
  8. Rewrite limit with x taken out: Now we rewrite the limit with the x taken out of the cube root. limx(xx+4839x3310+7x)\lim_{x \to \infty}\left(\frac{x \cdot \sqrt[3]{x + 48 - \frac{39}{x^3}}}{10 + 7x}\right)
  9. Negligible terms as xx approaches infinity: As xx approaches infinity, the terms 4848 and 39x3-\frac{39}{x^3} inside the cube root become negligible compared to xx. Similarly, the term 1010 in the denominator becomes negligible compared to 7x7x.limx(xx37x)\lim_{x \to \infty}\left(\frac{x \cdot \sqrt[3]{x}}{7x}\right)
  10. Cancel out xx in numerator and denominator: Simplify the expression by canceling out xx in the numerator and denominator.limx(x37)\lim_{x \to \infty}\left(\frac{\sqrt[3]{x}}{7}\right)
  11. Cube root of xx approaches infinity: As xx approaches infinity, the cube root of xx also approaches infinity.\newlinelimx(x3)/7=/7\lim_{x \to \infty}(\sqrt[3]{x})/7 = \infty/7
  12. Limit of constant divided by infinity: The limit of a constant divided by infinity is 00.limx(x3)/7=0\lim_{x \to \infty}(\sqrt[3]{x})/7 = 0

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