Respuesta :

Answer:

  • m= 4

Step-by-step explanation:

  • (-5)^(m + 3) × (-5)^8 = (-5)^15
  • (-5)^(m + 3 + 8) = (-5)^15
  • (-5)^(m + 11) = (-5)^15
  • m + 11 = 15
  • m = 4