Question

Factor completely p^4 – 18p^2 + 81

Answer 1

(p^2 - 9)(p^2 - 9)
(p-3)(p+3)(p-3)(p+3)
or
[(p-3)^2]*[(p+3)^2]

Answer 2

(p2 – 9)(p2 – 9)

(p – 3)2(p + 3)2

(p – 9)(p + 9)(p2 + 3)

(p – 3)(p + 3)(p2 – 3)

those are the choices