Respuesta :

Answer:

2x^3 + x^2 - 4x - (9x^3 - 3x^2) =

2x^3 + x^2 - 4x - 9x^3 + 3x^2 =

-7x^3 + 4x^2 - 4x

Answer: -7x^3 + 4x^2 - 4x

Hope that helps!