Calculus

just 3 questions

1

Find the indicated maximum or minimum value of f subject to the given constraint. Minimum: f(x,y) = 2x + y + 2xy + 3x+ 2y; y=x+1 . . . The minimum value is (Type an integer or a simplified fraction.)Find the extremum of f(x,y) subject to the given constraint, and state whether it is a maximum or a minimum. f(X.y)=x2+y2-xy;x+y=4 There is a value of D located at (x, y) = D. maximum minimum Find the extremum of f(x,y) subject to the given constraint, and state whether it is a maximum or a minimum. f(x,y)=2y2x2;2x+2y=8 There is a value of D located at (x, y) = D. maximum minimum