\[f(x) = \frac{5x^{2}}{x^{2} + 1};\ \ \ \ \]
\[f(2) + (f - 2) = ?\]
\[f(2) + f( - 2) =\]
\[= \frac{5 \cdot 2^{2}}{2^{2} + 1} + \frac{5 \cdot ( - 2)^{2}}{( - 2)^{2} + 1} =\]
\[= \frac{20}{5} + \frac{20}{5} = 4 + 4 = 8.\]