Respuesta :

9514 1404 393

Answer:

  -1/8 m^3 +7

Step-by-step explanation:

The only like terms are 3/8m^3 and -1/2m^3. Adding their coefficients, you get ...

  (3/8 -1/2)m^3 = (3-4)/8m^3 = -1/8m^3

Then the simplified expression is ...

  -1/8m^3 +7