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Find the limit as 
x approaches positive infinity.

lim_(x rarr oo)(5x^(2)+4)/(sqrt(4x^(4)+5x))=

Find the limit as x x approaches positive infinity.\newlinelimx5x2+44x4+5x= \lim _{x \rightarrow \infty} \frac{5 x^{2}+4}{\sqrt{4 x^{4}+5 x}}=

Full solution

Q. Find the limit as x x approaches positive infinity.\newlinelimx5x2+44x4+5x= \lim _{x \rightarrow \infty} \frac{5 x^{2}+4}{\sqrt{4 x^{4}+5 x}}=
  1. Simplifying the expression: To find the limit of the given function as xx approaches positive infinity, we need to analyze the behavior of the numerator and the denominator separately. We will start by simplifying the expression by dividing both the numerator and the denominator by the highest power of xx in the denominator, which is x2x^2.
  2. Removing terms as x approaches infinity: Divide the numerator and the denominator by x2x^2: \newlinelimx5x2/x2+4/x24x4/x2+5x/x2\lim_{x \to \infty} \frac{5x^2/x^2 + 4/x^2}{\sqrt{4x^4/x^2 + 5x/x^2}}\newlineSimplify the expression:\newlinelimx5+4/x24x2+5/x\lim_{x \to \infty} \frac{5 + 4/x^2}{\sqrt{4x^2 + 5/x}}
  3. Simplifying the square root: As xx approaches positive infinity, the terms 4x2\frac{4}{x^2} and 5x\frac{5}{x} in the expression will approach zero. Therefore, we can simplify the expression further by removing these terms:\newlinelimx(5+0)(4x2+0)\lim_{x \to \infty} \frac{(5 + 0)}{(\sqrt{4x^2 + 0})}\newlineThis simplifies to:\newlinelimx5(4x2)\lim_{x \to \infty} \frac{5}{(\sqrt{4x^2})}
  4. Final step: approaching zero: Now, we can simplify the square root in the denominator: 4x2=2x\sqrt{4x^2} = 2x (since xx is approaching positive infinity, we consider only the positive square root). So the expression becomes: limx52x\lim_{x \rightarrow \infty} \frac{5}{2x}
  5. Final step: approaching zero: Now, we can simplify the square root in the denominator: 4x2=2x\sqrt{4x^2} = 2x (since xx is approaching positive infinity, we consider only the positive square root). So the expression becomes: limx52x\lim_{x \rightarrow \infty} \frac{5}{2x} As xx approaches positive infinity, the term 2x2x in the denominator will also approach infinity, making the whole fraction approach zero: limx52x=0\lim_{x \rightarrow \infty} \frac{5}{2x} = 0