\textbf{114.} If $\displaystyle\lim_{x \to 2} \dfrac{3x - 5}{x^2 + ax + b} = -\infty$, what is $a + b$? \medskip \hfill (1) $-1$ \qquad (2) zero \qquad (3) $1$ \qquad (4) $2$ \medskip