A factorized tree of 2

Factorize: x^2+8x+10 i just solved it but i don't know if the process is correct

One month, a music site observed that 60% of the people who downloaded songs from its site downloaded q sam's latest single. the equation below represents this information, where x represents the total number of people who ddownloaded songs from the site that month: x = 0.6x + 384 how many people who downloaded songs from the site that month downloaded q sam's latest single?

What is 140 squared pleas me i am dumb