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[(" Quadratic Equations ")/(" Let "F(x)=...

[(" Quadratic Equations ")/(" Let "F(x)=x^(2)+4x+1." Then ")],[[" (1) "F(x)>0" for all "x," (2) "F(x)>1" when "x>=0],[F(x)>=1" when "x<=-4," (4) "F(x)=F(-x)" for all "x]]

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