Respuesta :

Answer:

go with the 3rd one! its the best choice

Answer:

C

Step-by-step explanation:

line up 'like terms' below each other:

  5[tex]x^{2}[/tex] + 9x + 3

-  6[tex]x^{2}[/tex]  + 3x + 0

remember, when you subtract then you 'add the opposite'

  5[tex]x^{2}[/tex] + 9x + 3

+ -6[tex]x^{2}[/tex] + 3x - 0

  -[tex]x^{2}[/tex] + 12x + 3