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Sagot :

PAN59
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
F(x) = 8xcaree+42x=0
X(8x+42) = 0
Donc
X= 0 ou 8x + 42 = 0
x = 0 ou x= -42/8

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