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Justiine974
@Justiine974
May 2019
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Aidez moi svp j'ai des exercices de math et j'arive pas a les faire.
Exercice 15_16_17
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rekikranimranim16
15/
1- f(x)= (x+2)²-9
= (x+2)²-3²
= (x+2-3)(x+2+3)
= (x-1)(x+5)
2- x²+5-x-5
x²+4x-5
3- (x-1)(x+5)=0
⇒x=1 ou x=5
16/ g(x)=0
⇒ (x-1)²-2²=0
(x-1-2)(x-1+2)
(x-3)(x+1)=0
donc x=3 ou x=-1
17/1- 2(x-5/2)²-1/2
= 2(x²-10/2x+(5/2)²)-1/2
= 2x²-10x+25/2-1/2
= 2x²-10x+12
2- 2(x-2)(x-3)
= 2(x²-3x-2x+6)
= 2(x²-5x+6)
= 2x²-10x+12
⇒h(x)=2(x-2)(x-3)
3 votes
Thanks 1
ELGarane10
bonne réponse raki
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Lista de comentários
1- f(x)= (x+2)²-9
= (x+2)²-3²
= (x+2-3)(x+2+3)
= (x-1)(x+5)
2- x²+5-x-5
x²+4x-5
3- (x-1)(x+5)=0
⇒x=1 ou x=5
16/ g(x)=0
⇒ (x-1)²-2²=0
(x-1-2)(x-1+2)
(x-3)(x+1)=0
donc x=3 ou x=-1
17/1- 2(x-5/2)²-1/2
= 2(x²-10/2x+(5/2)²)-1/2
= 2x²-10x+25/2-1/2
= 2x²-10x+12
2- 2(x-2)(x-3)
= 2(x²-3x-2x+6)
= 2(x²-5x+6)
= 2x²-10x+12
⇒h(x)=2(x-2)(x-3)