Hello everyone!

No need to answer this question, I solved it.

prove or disprove: $\displaystyle 4n^3 + n^2\sqrt{n}-4n \in \Theta (n^3)$

I don't have any clue. Does anyone know how to solve this?

I think $\displaystyle 4n^3 + n^2\sqrt{n}-4n \in \Theta (n^3)$ is true, because

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Thank you,

Rapha