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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)(sqrt(23 x+64x^(9)))/(7x^(4)+6x^(3))
Answer:

Determine the following limit in simplest form. If the limit is infinite, state that the limit does not exist (DNE).\newlinelimx23x+64x97x4+6x3 \lim _{x \rightarrow \infty} \frac{\sqrt{23 x+64 x^{9}}}{7 x^{4}+6 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).\newlinelimx23x+64x97x4+6x3 \lim _{x \rightarrow \infty} \frac{\sqrt{23 x+64 x^{9}}}{7 x^{4}+6 x^{3}} \newlineAnswer:
  1. Identify Highest Power: To find the limit of the given function as xx approaches infinity, we need to analyze the behavior of the numerator and the denominator separately. We look for the highest power of xx in both the numerator and the denominator to simplify the expression.
  2. Simplify by Dividing: In the numerator, the highest power of xx inside the square root is x9x^9, and in the denominator, the highest power of xx is x4x^4. To simplify, we can divide both the numerator and the denominator by x4x^4, the highest power in the denominator.
  3. Evaluate Terms: When we divide each term by x4x^4, we get the following:\newlineNumerator: 23xx4+64x9x4=23x3+64x5\sqrt{\frac{23x}{x^4} + \frac{64x^9}{x^4}} = \sqrt{\frac{23}{x^3} + 64x^5}\newlineDenominator: 7x4x4+6x3x4=7+6x\frac{7x^4}{x^4} + \frac{6x^3}{x^4} = 7 + \frac{6}{x}
  4. Remove Terms Approaching Zero: As xx approaches infinity, any term with xx in the denominator will approach zero. Therefore, 23x3\frac{23}{x^3} approaches 00 and 6x\frac{6}{x} approaches 00.
  5. Final Simplification: After removing the terms that approach zero, we are left with:\newlineNumerator: 64x5\sqrt{64x^5}\newlineDenominator: 77
  6. Simplify Square Root: We can simplify the square root of 64x564x^5 as 8x5/28x^{5/2}, because 64\sqrt{64} is 88 and x9\sqrt{x^9} is x9/2x^{9/2}.
  7. Final Limit Calculation: Now we have the simplified form of the limit: limx(8x5/27)\lim_{x \rightarrow \infty}\left(\frac{8x^{5/2}}{7}\right)
  8. Limit Does Not Exist: Since x5/2x^{5/2} approaches infinity as xx approaches infinity, the whole expression approaches infinity. Therefore, the limit does not exist (DNE).

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