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vexon
@vexon
January 2021
1
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bonjour
je n'arrive pas a faire le d) du 2)
merci d'avance
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scoladan
Verified answer
Bonjour,
2)d)
x^2 + 8x + 7 = (x+1)(x+7)
Donc on va choisir la forme f(x) = (x+1)^3 - (x+1)(x+7)
Et donc (x+1)^3 - (x+1)(x+7) = -(x+1)(x+7)
<=> (x+1)^3 = 0
==> x+1 = 0
==> x = -1
1 votes
Thanks 0
vexon
comment t'a fait pour avoir (x+1)(x+7) s'il te plait
scoladan
Soit on "voit" que -1 est solution et on factorise (x+1). Soit on calcule le discriminant pour trouver les racines (si tu es en 1ère ou +)
vexon
et toi t'a fait la 2éme solution
scoladan
nan nan la première, c'est moins fatiguant :) Tu as le droit de dire que -1 est racine évidente
vexon
ok merci
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Verified answer
Bonjour,2)d)
x^2 + 8x + 7 = (x+1)(x+7)
Donc on va choisir la forme f(x) = (x+1)^3 - (x+1)(x+7)
Et donc (x+1)^3 - (x+1)(x+7) = -(x+1)(x+7)
<=> (x+1)^3 = 0
==> x+1 = 0
==> x = -1