Indefinite Integrals!!! HELP PLEASE!!!?

Question

∫[(2x³ + 3)² / x] dx

∫[ (-3e^1/x³) / x^4 ] dx

∫(5x^4 + 6x^2 / x^5 +2x³+ 3) dx

∫10 (7 + √x^9 / √x ) dx

Answer 1

extremely usefull for checking your answers is :

http://wims.unice.fr/wims/wims.cgi?session=QSD743C25D.4&+lang=en&+cmd=resume&+module=tool%2Fanalysis%2Ffunction.en

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Answer 2

First one: expand brackets and divide every term by x, then integrate.

Second one: make the substitution y = 1/x^3

Third one: partial fractions

Fourth: get rid of that radical.