I would recommend using the hook method for this problem
multiply the 9 to the back (8) to get
p^2 + 6p + 72
To get to (p +- _) (p+-_) form you must find out what 2 numbers add or subtract to get 6 and multiply to be 72.
These numbers are 12 and 6.
The factored form would be (p+12)(p-6)