Suppose that f(x,y)=x2−xy+y2−3x+3y\displaystyle {f{{\left({x},{y}\right)}}}={x}^{{2}}-{x}{y}+{y}^{{2}}-{3}{x}+{3}{y} with x2+y2≤9\displaystyle {x}^{{2}}+{y}^{{2}}\le{9}.
  1. Absolute minimum of f(x,y)\displaystyle {f{{\left({x},{y}\right)}}} is  
  2. Absolute maximum is   .

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