Respuesta :

thezekromninja

Answer:

[tex]9x^3-8x^2[/tex]

Step-by-step explanation:

[tex](7x^3-4x^2)+(2x^3-4x^2)[/tex]

Combine [tex]7x^3[/tex] and [tex]2x^3[/tex] to get [tex]9x^3[/tex].

[tex]9x^3-4x^2-4x^2[/tex]

Combine [tex]4x^2[/tex] and

9x^3-8x^2

Hope this helps.