Respuesta :

Answer:

[tex]3 {x}^{2} [/tex]

[tex] - y[/tex]

[tex]9x[/tex]

Step-by-step explanation:

combine like terms

Here are your answers

x^2 + 2x^2 = 3x^2

y - 2y = -y

4x + 5x = 9x

Hope it helps
Have a great day :)