Respostas

2013-11-09T07:56:27-02:00
F(x) = u/v --> f'(x) = u'v - uv' / v² --> f'(x) = 3 . (x²+7) - (3x-1).(2x) / (x²+7)²
f'(x) = [3x²+21-6x²-2x] / (x²-7)²
f'(x) = [-3x²-2x+21] / (x²-7)²