bjr
C(2) = (2+1/2) (2-3/4)
C(2) = (4/2 + 1/2) (8/4 - 3/4)
C(2) = 5/2 x 5/4
C(2) = 25/8 = 3,125
C(-1/2) = (-1/2+1/2).. pas la peine de continuer = 0
développons C(x)
C(x) = (x+1/2) (x-3/4)
= -3/4x + x² + 1/2x - 3/8
= x² + 2/4x - 3/4x - 3/8
= x² - 1/x - 3/8 ok