bonsoir
A = - 5 x + 6 x² - 3 x + 3
= 6 x² - 8 x + 3
B = 6 + 15 y - 15 y² - 6 + 6 y
= - 15 y² + 21 y
C = - 4 x² - 2 x² + 3 x - 1 - 4 x + 3 x
= - 6 x² + 2 x - 1
d = 5 z - 6 z² - 15 z - 6 z - 15
= - 6 z² - 16 z - 15
bonne soirée
Bonjour;
A=
-5x +6x² -3x +3
= 6x² -8x+3
B=
6 +15y -15y² -6+6y
= -15y² +21y
C =
4x² -2x² +3x-1 -4x² +3x
= -2x² -6x -1
D =
5z-6z² -15z -6z -15
= -6z² -16z -15
