I have questions with the solutions below but I'm still having trouble understanding how to solve these problems?
Like for a) I don't understand how 17$n^2$ + 4𝑛 got turned into 17$n^2$ + 4$n^2$. I also don't know what happened to the -3 for the first part of the inequality?
I'd really appreciate it if someone could walk me through the general solution of how to solve these types of questions.
Additionally, I was also wondering what difference would it make if the O was a Ω symbol instead? I've seen similar questions in my textbook like 4$n^2$ + 3𝑛log𝑛 + 7$n^3$ is Ω($n^3$) and was wondering what difference would this make in the solution?