11.11.11 Function Extrema

Condition: Find the smallest and largest function of the function \ (z = f (x, y) \) in the closed area \ (d \), a given system of inequalities. Make the drawing of the area \ (d \). \ [z = 3-2 x^{2} -x y-y^{2}, z \ leq 1, y \ geq 0, y \ leq x \]