Respuesta :

Notice that

[tex]\begin{gathered} x^2\ge0,x\in\Re \\ \Rightarrow x^2+3\ge3,x\in\Re \\ \Rightarrow f(x)\ge3,x\in\Re \end{gathered}[/tex]

Therefore, the range of the function is f(x)>=3, or [3,infinite)

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