Respuesta :

xansforaliyah

Answer:

-4x^3+12x^2-1

Step-by-step explanation:

silirobert15
We have (-4x^3+2x^2-9) + 2(5x^2+4)
= -4x^3 + 2x^2 - 9 + 10x^2 + 8
= -4x^3 + 12x^2 - 1

Ok done. Thank to me:>