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F(x)=x^2-2x+4
[tex]\\ \sf\longmapsto F(|-4|)[/tex]
[tex]\\ \sf\longmapsto F(4)[/tex]
[tex]\\ \sf\longmapsto 4^2-2(4)+4[/tex]
[tex]\\ \sf\longmapsto 16-8+4[/tex]
[tex]\\ \sf\longmapsto 8+4[/tex]
[tex]\\ \sf\longmapsto 12[/tex]