Respuesta :
x⁶ – 9, it could be written as x⁶ - 3², which expression is the difference of 2 squares (a² - b²) = (a-b)(a+b)
x⁶ - 3³ = (x³-3)(x³+3)
x⁶ - 3³ = (x³-3)(x³+3)