Let f(x) = x + 2x. (a) Find the derivative f' of f. f'(x) = 2x+2 Nicely done! (b) Find the point on the graph of f where the tangent line to the curve is horizontal. (Hint: Find the value of x for which f'(x) = 0.) (x, y) = -1,-1 (c) Sketch the graph of f and the tangent line to the curve at the point found in part (b). No Solution -10 B #7 5 + 10: 9 B 7 6 12 15 4 17 3 2 44 4 5 9 A 10 Graph Layers Vertical Parabola 1 Vertical Parabola 2 * X X