Bonjour,
Exercice 1 : Révise bien :p
Exercice 2 :
1)
C(-2)=(-2-3)(5-2×(-2))=-5×(5+4)=-5×9=-45
D(-2)=-2×(-2)²+11×(-2)-15=-2×4-22-15=-8-22-15=-45
C(-2)=D(-2)
2)
C(-1)=(-1-3)(5-2×(-1))=-4×(5+2)=-4×7=-28
D(-1)=-2×(-1)²+11×(-1)-15=-2×1-11-15=-28
C(-1)=D(-1)
3)
C(0,5)=(0,5-3)(5-2×0,5)=-2,5×4=-10
D(0,5)=-2×0,5²+11×0,5-15=-10
4)
C(0,5)=D(0,5)
5)
B2 : =(A2-3)*(5-2*A2)
6)
C2: = -2*A2*A2+11*A2-15
7)
Regard les fichiers joints .
8)
On peut conjecturer que D(x)=C(x)
C(x)=(x-3)(5-2x)
C(x)=5x-2x²-15+6x
C(x)=-2x²+11x-15=D(x)
