f(x, )0 = 968328 The critical point at the origin is: ? f(xvy)=1_x8y8 The critical point at the origin is: neither a local maximum nor a local minim f(x, y) = xy8 The critical point at the origin is: neither a local maximum nor a local minim f(x,y) = X3328 The critical point at the origin is: neither a local maximum nor a local minim f(x,y) = x3y3 The critical point at the origin is: neither a local maximum nor a local minim f(x, y) = 368))2 The critical point at the origin is: neither a local maximum nor a local minim (> (> (> (> (> O