Chapter 3 - Question 3.14. Really not understanding part i.

hey guys,

So I am trying to solve Q3.14 part i.

I was trying at first by myself. So I just integrated the given f(x) in the questions from 0 to infinity and equating it to 1. But I got stuck and could not go forward. I looked at the solution. I cant understand how they solved it.

How did they get the equation after the first sentence - "The cumulative distribution function is"?

Thanks.


* Edit 1: So I just turned back few pages and on page 9 it says that you can only integrate from -inf to x for cont rand var.

 

So, which part of your question you are yet to figure out?