Réponses

2013-04-28T17:34:57+02:00

f'(x) = a + 16/x²

f(2) = 4 => 2a + b - 8 = 4

f'(2) = 0 => a + 16/4 = 0 => a + 4 = 0 => a = -4 => 8 + b - 8 = 4 => b = 4