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Dim14
@Dim14
May 2019
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Bonjour, je n’arrive pas à réaliser cette exercice. Pourriez vous m’aider s’il vous m’aider plaît ? Merci d’avance.
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1D2010
Bonsoir,
a.
x^2+6x+9=0
(x+3)^2=0
x+3=0
x=-3
b.
1+8x+16x^2=0
(1+4x)^2=0
1+4x=0
x=-1/4
e.
25x^2-9=0
(5x-3)(5x+3)=0
5x-3=0 ou 5x+3=0
x=3/5 ou x=-3/5
d.
x^2-16=0
(x-4)(x+4)=0
x=4 ou x=-4
Bonne chance !
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Lista de comentários
a.
x^2+6x+9=0
(x+3)^2=0
x+3=0
x=-3
b.
1+8x+16x^2=0
(1+4x)^2=0
1+4x=0
x=-1/4
e.
25x^2-9=0
(5x-3)(5x+3)=0
5x-3=0 ou 5x+3=0
x=3/5 ou x=-3/5
d.
x^2-16=0
(x-4)(x+4)=0
x=4 ou x=-4
Bonne chance !