Question: Minimize f(x,y) = x+xy+y2 subject to y= -20 without using the method of Lagrange multipliers; instead, solve the constraint for x or y and

Minimize f(x,y) = x+xy+y2 subject to y= -20 without using the method of Lagrange multipliers; instead, solve the constraint for x or y and substitute into f(x,y). Use the constraint to rewrite f(x,y) = x + xy + y2 as a function of one variable, g(x). g(x)=

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