Répondre :
Bonjour.
On a:
a = -8
b = 42
c = 0
delta = b²-4ac = 1764
racine(delta) = 42
x1 = -b-racine(delta)/2a = -42 - 42/-16 = -39,38
x2 = -b + raine(delta)/2a = -42 + 42/-16 = -44,63
On a:
a = -8
b = 42
c = 0
delta = b²-4ac = 1764
racine(delta) = 42
x1 = -b-racine(delta)/2a = -42 - 42/-16 = -39,38
x2 = -b + raine(delta)/2a = -42 + 42/-16 = -44,63
F(x) = 8xcaree+42x=0
X(8x+42) = 0
Donc
X= 0 ou 8x + 42 = 0
x = 0 ou x= -42/8
X(8x+42) = 0
Donc
X= 0 ou 8x + 42 = 0
x = 0 ou x= -42/8