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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(64x^(6)+12x^(5)+42x^(4)))/(7+6x^(2))
Answer:

Determine the following limit in simplest form. If the limit is infinite, state that the limit does not exist (DNE).\newlinelimx64x6+12x5+42x47+6x2 \lim _{x \rightarrow \infty} \frac{\sqrt{64 x^{6}+12 x^{5}+42 x^{4}}}{7+6 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).\newlinelimx64x6+12x5+42x47+6x2 \lim _{x \rightarrow \infty} \frac{\sqrt{64 x^{6}+12 x^{5}+42 x^{4}}}{7+6 x^{2}} \newlineAnswer:
  1. Factor Out Highest Power: We are given the limit expression limx(64x6+12x5+42x47+6x2)\lim_{x \to \infty}\left(\frac{\sqrt{64x^{6}+12x^{5}+42x^{4}}}{7+6x^{2}}\right). To simplify this, we will first factor out the highest power of xx in the numerator inside the square root.
  2. Factor Out x6x^6: Factor out x6x^6 from the square root in the numerator to simplify the expression inside the square root.\newline64x6+12x5+42x4=x6(64+12/x+42/x2)\sqrt{64x^{6}+12x^{5}+42x^{4}} = \sqrt{x^{6}(64+12/x+42/x^{2})}
  3. Take x3x^3 Out: Now, we can take x3x^3 out of the square root, since x6=x3\sqrt{x^{6}} = x^{3}.x6(64+12/x+42/x2)=x364+12/x+42/x2\sqrt{x^{6}(64+12/x+42/x^{2})} = x^{3}\sqrt{64+12/x+42/x^{2}}
  4. Divide by x2x^2: Next, we will divide both the numerator and the denominator by x2x^2, the highest power of xx in the denominator.\newlinex364+12x+42x27+6x2=x3/x264+12x+42x217/x2+6\frac{x^{3}\sqrt{64+\frac{12}{x}+\frac{42}{x^{2}}}}{7+6x^{2}} = \frac{x^{3}/x^{2}}{\sqrt{64+\frac{12}{x}+\frac{42}{x^{2}}}}\frac{1}{7/x^{2}+6}
  5. Simplify Expression: Simplify the expression by canceling out x2x^2 from x3x2\frac{x^{3}}{x^{2}} and simplifying the square root as xx approaches infinity.\newline\frac{x^{\(3\)}}{x^{\(2\)}}\left(\sqrt{\(64\)+\frac{\(12\)}{x}+\frac{\(42\)}{x^{\(2\)}}}\right)\div\left(\frac{\(7\)}{x^{\(2\)}}+\(6\right) = x\left(\sqrt{6464+\frac{1212}{x}+\frac{4242}{x^{22}}}\right)\div\left(\frac{77}{x^{22}}+66\right)
  6. Approach Infinity: As xx approaches infinity, the terms 12x\frac{12}{x}, 42x2\frac{42}{x^2}, and 7x2\frac{7}{x^2} in the expression will approach 00.x(64+12x+42x2)7x2+6\frac{x(\sqrt{64+\frac{12}{x}+\frac{42}{x^2}})}{\frac{7}{x^2}+6} = x(64+0+0)0+6\frac{x(\sqrt{64+0+0})}{0+6}
  7. Find Limit: Now we have a simplified expression where we can easily find the limit as xx approaches infinity.x646=x(8)6=43x\frac{x\sqrt{64}}{6} = \frac{x(8)}{6} = \frac{4}{3}x
  8. Find Limit: Now we have a simplified expression where we can easily find the limit as xx approaches infinity.x646=x(8)6=43x\frac{x\sqrt{64}}{6} = \frac{x(8)}{6} = \frac{4}{3}xThe limit of 43x\frac{4}{3}x as xx approaches infinity is infinity, which means the limit does not exist (DNE).limx(43x)=\lim_{x \to \infty}\left(\frac{4}{3}x\right) = \infty

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