Calculate the probability distribution function for the following density function
the answer is:
but I did not realize how the constant factor = -1 has been calculated please help thanks
I think you have wrote the starting line of your question incorrectly.. You already have the probability distribution function $\displaystyle f_X(x)$ and you are supposed to find the cumulative distribution function $\displaystyle F_X(x)$. Looks like you have written the opposite.
please look at how you can find the cumulative distribution function of a random variable . You have to integrate the pdf over ...... region