1.4 Lösning 2a

\( \, f(x) = \) \( {x^2 - 4\,x + 3 \over 2\,x^2 + 3} \)

\( f(3) = \) \( {3^2 - 4 \cdot 3 + 3 \over 2 \cdot 3^2 + 3} = {9 - 12 + 3 \over 2 \cdot 9 + 3} = {-3 + 3 \over 18 + 3} \) \( = 0 \)