Exo1:
a) solutions: (-1,-1/2)
b) (x²+3x-1)(x-4) = x^3 - 4x² + 3x² - 12x - x + 4 = x^3 - x² - 13x + 4
solutions: (4 ; (-3+V5)/2 ; (-3-V5)/2 )
Exo2:
a) solutions: (3 ; -4)
b) f'(x) = 2x+1
-oo -1/2 +oo
2x+1 -- 0 +
f(x) \ -49/4 /
c) solution: ]-oo ; -4]U[3 ; +oo[
d) S(-1/2 ; -49/4)
e) fait a la question (b)
