Respuesta :

1)(X-5)(X+5)
2)(3x+3)(X-5). -15x+3x= -12x and 3x-5=-15
X^3+2x^2. +3x+6
X^2(X+2). 3(X+2)
Both have (X+2) in common so answer is
3). (X^2+3)(X+2)