Answers:
I'll assume you forgot parentheses around the top part.
(p^2 -9) / (p+3)^3
Now there are actually factors of 1 to remove.
You can factor p^2 -9 into (p-3)(p+3)
(p^2 -9) / (p+3)^3
= (p-3)(p+3) / (p+3)^2
You can cancel the (p+3) on top with one of the (p+3)'s on bottom.
= (p-3)/(p+3)
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