Respuesta :

lc2002
The simplified expression is -3x^2 - 2x + 6. Hope this helps! ;)
araine86
Simplifying: 

2x^2 + (4x - 5x^2) + 9 - (6x + 3)

2x^2 + 4x - 5x^2 + 9 - 6x - 3

End Result: -3x^2-2x+6