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-3 and 3 and dont think 0 is one of the asnwers

it is undefined if the bottom = 0

p^2 - 9 = 0

p^2 = 9

p = -3 or 3

maybe your confused about squaring zero or something, you can do that 0^2 = 0

I'm assuming that's a negative and not a double negative in the denominator. If the denominator is p^2 - 9, then -3 and 3 would be an undefined denominator. the "0" would equal a denominator of -9, which is legit.

0 is not correct because the value of the denominator is -9 which is ok. Your other two answers are right because the value of the denominator is 0.