Respuesta :

ANSWER

2x² - x - 4

EXPLANATION

To solve this we have to add like terms:

[tex]-9x^2-4+6x+11x^2-7x[/tex]

Like terms are those that have x with the same power:

[tex](-9x^2+11x^2)+(6x-7x)-4=2x^2-x-4[/tex]