(a) Show that if a is a positive constant, then x = 0 isthe only critical point of f(x)

Chapter 4, Problem 20

(choose chapter or problem)

(a) Show that if a is a positive constant, then x = 0 isthe only critical point of f(x) = x + ax.(b) Use derivatives to show that f is increasing and itsgraph is concave down for all x > 0.

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