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Find the absolute extrema (absolute max/min) of ?(?, ?) = ?? − ? − 2? +...

Find the absolute extrema (absolute max/min) of ?(?, ?) = ?? − ? − 2? + 8 on the triangular region ? with vertices (0,0), (4,0), ??? (0,4). Draw the region and call the boundary on the x-axis ?1 (?, ?), the boundary on the y-axis ?2 (?, ?), and the boundary on the diagonal of the triangle ?3 (?, ?). Note: Re-write each boundary as a function of one-variable.

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