(2) For what values of a does the graph of the following function have a horizontal tangent line? d dx t f(x) = x²e-2x f'(x)= = -2x28 = x²e-2x te=²x2x こ 2 -2x e لے x²=//=²²*² +6²-²x + / +² +2 d te 2 dre Jx с +² +2x 2x -2x e = x (x + 2) 2 X x(x+2) e 2+ +(x+2) e = 0 -200

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