Respuesta :

Answer:

[tex]4x^2+x-1[/tex]

Explanation:

Given the polynomials:

[tex]3x^2+x+8\; and\; x^2-9[/tex]

Their sum will be:

[tex]\begin{gathered} (3x^2+x+8)+(x^2-9) \\ =3x^2+x^2+x+8-9 \\ =4x^2+x-1 \end{gathered}[/tex]

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