Question

F(x)=1-2x^2 / x^2 +1.Calculand F(√2)

Answer 1

f(√2)=1-4/2+1=-3/3=-1

Answer 2

$F(x)=\frac{1-2x^2}{x^2+1}=\ \textgreater \ F(\sqrt{2})=\frac{1-2*(\sqrt{2})^2}{(\sqrt{2})^2+1}=\\ = \frac{1-2*2}{2+1}=\frac{1-4}{3}=\frac{-3}{3}=-1$
Success!