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Karameriam
@Karameriam
April 2019
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Résoudre 2x^2+4x-6=-6
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nathalienouts
Verified answer
2x²+4x-6 = -6
2x²+4x = 6-6
2x²+4x = 0
2x(x+2) = 0
x = 0 ou x+2 = 0
x = 0 ou x = -2
1 votes
Thanks 1
medericd
2x^2+4x-6=-6
2x^2+4x=0
Δ= b^2 - 4ac
= 4^2 - 0 (car c=0)
= 16
x1 = (-b-√(Δ))/(2a)
= (-4-4)/(4)
= -8/4 = -2
x2 = (-b+√(Δ))/(2a)
= (-4+4)/(4)
= -0/4 = 0
Donc x1=-2 et x2=0
0 votes
Thanks 1
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Verified answer
2x²+4x-6 = -62x²+4x = 6-6
2x²+4x = 0
2x(x+2) = 0
x = 0 ou x+2 = 0
x = 0 ou x = -2
2x^2+4x=0
Δ= b^2 - 4ac
= 4^2 - 0 (car c=0)
= 16
x1 = (-b-√(Δ))/(2a)
= (-4-4)/(4)
= -8/4 = -2
x2 = (-b+√(Δ))/(2a)
= (-4+4)/(4)
= -0/4 = 0
Donc x1=-2 et x2=0