Need help

when a pattern says knit 8 (purl 8 knit 4) 9 times purl 8, knit 8 its for a baby blanket and i really need help

mdkb, you would do this:
knit 8, then purl 8, knit 4 nine times
so it would be:
k8, p8, k4, p8, k4, p8, k4, p8, k4, p8, k4, p8, k4, p8, k4, p8, k4, p8, k4, then p8, k8
You do whatever is in parenthesis however many times it tells you to, then do the rest of the pattern.