The area (in square units) of the region \(\{(x, y) : x^2 - 8x \le y \le -x\\), is
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For the area between \( y = ax^2 + bx + c \) and \( y = mx + k \), if the intersection points are \( \alpha \) and \( \beta \), the area is \( \frac{|a|}{6} (\beta - \alpha)^3 \).