Question: Hi, I would like to know what is wrong with my reasoning here. Did I do right in getting rid of x^3 with (-1/x^2)dx=du?, and

Hi, I would like to know what is wrong with my reasoning here. Did I do right in getting rid of x^3 with (-1/x^2)dx=du?, and substituting by u? I have found that the integral diverges but clearly it's not the case.

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