Respuesta :

ghaithgh

Answer:

[tex](f + g)(x) = (3x + 9) + (5 {x}^{2} ) \\ = 5 {x}^{2} + 3x + 9[/tex]

I hope I helped you^_^

Answer:

5x² + 3x + 9

Step-by-step explanation:

(f + g)(x)

= f(x) + g(x)

= 3x + 9 + 5x²

= 5x² + 3x + 9 ← in standard form

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