Respuesta :

bcalle
2(x^4 - 10x^2 - 39)
2(x^2 - 13)(x^2 + 3)

Letter B
KitKat69
Divide everything by 2: 2(x4-10x2-39). Now factor: 2(x2+3)(x2-13) or B. We know it's not A because the last variable is negative so the signs must be different. :)