Respuesta :

Banabanana
use the formula a²-b² = (a-b)(a+b)

   p⁴ - 81
= (p²)² - (9)²
= (p²+9)(p²-9)       first option
= (p²+9)(p² - 3²)
= (p²+9)(p+3)(p-3)  third option