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GaranceGrth
@GaranceGrth
May 2019
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Hello la population ! J'ai besoin d'aide pour cet exercice sur les fontions et équations, car elles et moi, ça fait 2...
Merci beaucoup d'avance, et bonne journée
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trudelmichel
Verified answer
Bonjour,
f(x)=(x+3)²-(x+3)(5-x)
f(x)=(x²+6x+9)-(5x+15-x²-3x)
f(x)= x²+6x+9-5x-15+x²+3x
f(x)=2x²+4x-6
2)
f(x)=(x+3)²-(x+3)(5-x)
f(x)=(x+3)((x+3)-(5-x)
f(x)=(x+3)(x+3-5+x
f(x)=(x+3)(2x-2)
3)
f(0)= (2(0²)+4(0)-6
f(0)=-6
f(-3)= (-3+3)(2(-3)-2)
f(-3)= 0(-6-2)
f(-3)=0
f(5)=(5+3)(2(5)-2)
f(5)=8( 10-2)
f(5)= 8x8
f(5)=64
(x+3)(2x-2)=0
x+3=0 x=-3
2x-2=0 2x=2 x=2/2 x=1
antécédent de 0
f(x)=0
alors x=-3 et x=1
f(x)=-6
2x²+4x-6=-6
2x²+4x-6+6=0
2x²+4x=0
2x(x+2)=0
2x=0 x=0
x+2=0 x=-2
f(x)=-6 antécédente de -6
x=0 et x=-2
Si A ∈ C(f) alors
(-1;-8) vérifient
-8=(-1+3)(2(-1)-2)
-8= (2) (-2-2)
-8=2(-4)
-8=-8
A∈ C(f)
1 votes
Thanks 1
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Lista de comentários
Verified answer
Bonjour,f(x)=(x+3)²-(x+3)(5-x)
f(x)=(x²+6x+9)-(5x+15-x²-3x)
f(x)= x²+6x+9-5x-15+x²+3x
f(x)=2x²+4x-6
2)
f(x)=(x+3)²-(x+3)(5-x)
f(x)=(x+3)((x+3)-(5-x)
f(x)=(x+3)(x+3-5+x
f(x)=(x+3)(2x-2)
3)
f(0)= (2(0²)+4(0)-6
f(0)=-6
f(-3)= (-3+3)(2(-3)-2)
f(-3)= 0(-6-2)
f(-3)=0
f(5)=(5+3)(2(5)-2)
f(5)=8( 10-2)
f(5)= 8x8
f(5)=64
(x+3)(2x-2)=0
x+3=0 x=-3
2x-2=0 2x=2 x=2/2 x=1
antécédent de 0
f(x)=0
alors x=-3 et x=1
f(x)=-6
2x²+4x-6=-6
2x²+4x-6+6=0
2x²+4x=0
2x(x+2)=0
2x=0 x=0
x+2=0 x=-2
f(x)=-6 antécédente de -6
x=0 et x=-2
Si A ∈ C(f) alors
(-1;-8) vérifient
-8=(-1+3)(2(-1)-2)
-8= (2) (-2-2)
-8=2(-4)
-8=-8
A∈ C(f)