Respuesta :

Answer:

12x^2

Step-by-step explanation:

All you need to do is combine like terms

since 9x^2 and 3x^2 are like terms with the same variable and same degree, they can be combined to get 12x^2
9x²＋3x²
＝(9＋3)x²
＝12x²

Hope my answer helped u :)

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