Find a function $g(x)=c x^{p}$ such that $f(x) \sim g(x)$ as $x \rightarrow \infty$ where $$ f(x)=\f ...

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Find a function $g(x)=c x^{p}$ such that $f(x) \sim g(x)$ as $x \rightarrow \infty$ where $$ f(x)=\frac{\sqrt{4 / x}}{\frac{3}{x}+\frac{5}{x^{2}}} . $$ You do not have to prove your answer but we should be able to see how you got it.