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Lele20002
@Lele20002
May 2019
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Bonsoir, je suis restée une heure à cogiter sur ce dm, je ne trouve pas de réponse. Pouvez-vous m'aider ? Les inéquations et moi ça fait deux!
a) (2x-1)(3x+1)≤(4-x)(3x+1)
b) (x-2)(x+1)>(2x+1)(2x+2)
c) ( x+1)²≥ x²-1
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nadiab
Bonsoir,
a) (2x-1)(3x+1)≤(4-x)(3x+1)
(2x-1)(3x+1)- (4-x)(3x+1)
≤ 0
(3x+1)[(2x-1)-(4-x) ]
≤ 0
(3x+1)(2x-1-4+x) ≤ 0
(3x+1)(3x-5) ≤ 0
3x+1=0 ou 3x-5=0
x=-1/3 x = 5/3
b) (x-2)(x+1)>(2x+1)(2x+2)
(x-2)(x+1) -2(2x+1)(x+1) > 0
(x+1)[(x-2)- 2(2x+1)] > 0
(x+1)(x-2-4x-2) > 0
(x+1)(-3x-4) > 0
x=-1 ou x= -4/3
c) ( x+1)²≥ x²-1
x²+2x+1 -x²+1
≥ 0
2x+2 ≥ 0
x ≥ -2/2
x ≥ -1
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Lista de comentários
a) (2x-1)(3x+1)≤(4-x)(3x+1)
(2x-1)(3x+1)- (4-x)(3x+1) ≤ 0
(3x+1)[(2x-1)-(4-x) ] ≤ 0
(3x+1)(2x-1-4+x) ≤ 0
(3x+1)(3x-5) ≤ 0
3x+1=0 ou 3x-5=0
x=-1/3 x = 5/3
b) (x-2)(x+1)>(2x+1)(2x+2)
(x-2)(x+1) -2(2x+1)(x+1) > 0
(x+1)[(x-2)- 2(2x+1)] > 0
(x+1)(x-2-4x-2) > 0
(x+1)(-3x-4) > 0
x=-1 ou x= -4/3
c) ( x+1)²≥ x²-1
x²+2x+1 -x²+1 ≥ 0
2x+2 ≥ 0
x ≥ -2/2
x ≥ -1