Respuesta :

naǫ
[tex]f(x)=8-3x^2 \hbox{ when } x=3 \\ \Downarrow \\ f(3)=8-3 \times 3^2=8-3 \times 9=8-27=\boxed{-19}[/tex]

The answer is -19.
F(x)=8-3x2
f(3)=8-3(3)2
8-27=-19

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