Respuesta :

devishri1977

Answer:

Step-by-step explanation:

When base are same, add the powers.

[ (-5)⁷ (-5)⁸ ]³ = [ (-5)⁷⁺⁸ ]³

                    = [ (-5)¹⁵ ]³

                    = (-5)¹⁵*³

                   = (-5)⁴⁵