Respuesta :

I believe it’s -12x but I may be wrong I hope this helped!

Answer:

[tex](f + g)(x) = ( \frac{x}{2} - 3) + (3 {x}^{2} + x - 6) \\ \\ = 3 {x}^{2} + (\frac{x + 2x}{2} ) - 9 \\ \\ = 3 {x }^{2} + \frac{3x}{2} - 9 \\ \\ [/tex]

I hope I helped you^_^

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