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Ch $03$ Sec $2$ Ex $08$ MAIN $-$ Big O Estimates

NOTE: This is a multi$-$part.question. Once an answer is submitted, you will be unable to return to this part. For each of these functions, find the least integer $n$ such that $f(x)$ is $O(x^n).$

Ch $03$ Sec $2$ Ex $08($d$)-$ Big O Estimates

If $f(x)=\frac{(x^3+5logx)}{(x^4+1)}$ then the least integer $n$ is