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7. ν•¨μˆ˜ $f(x) = \frac{1}{3}x^3 - 2x^2 - 12x + 4$κ°€ $x = \alpha$μ—μ„œ κ·ΉλŒ€μ΄κ³ 

$x = \beta$μ—μ„œ κ·Ήμ†ŒμΌ λ•Œ, $\beta - \alpha$의 값은? (단, $\alpha$와 $\beta$λŠ” μƒμˆ˜μ΄λ‹€.) [3점]

\begin{itemize}
    \item[1] $-4$
    \item[2] $-1$
    \item[3] $2$
    \item[4] $5$
    \item[5] $8$
\end{itemize}