If the range of the function \( f(x)=\frac{5-x}{x^{2}-3x+2},\ x\neq 1,2, \) is \( (-\infty,\alpha]\cup[\beta,\infty) \), then \( \alpha^{2}+\beta^{2} \) is equal to:
\( 194 \)
\( 192 \)
\( 188 \)
\( 190 \)