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Khaled12
@Khaled12
May 2019
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Bonsoir, j'ai besoin d'aide pour l'exercice 1 seulement s'il vous plait, je n'y comprend pas trop.
Niveau : seconde.
Merci d'avance !
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Amateur
Bonsoir,
1a) f(0)=4
1b)f(0)=a*0²+b*0+c=c
1c) c=4
2a) f(-2)=0
f(4)=0
2b) c)
4*a-2*b+4=0 ==> 2a-b=-2
16*a+4*b+4=0==>4a+b=-1
2d) On additionne les 2 équations membres à membre:
6a=-3 ==>a=-1/2
b=-1-4*a=-1-4*(-1/2)=-1+2=1
f(x)=-x²/2+x+4
1 votes
Thanks 1
khaled12
Merci beaucoup !
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1a) f(0)=4
1b)f(0)=a*0²+b*0+c=c
1c) c=4
2a) f(-2)=0
f(4)=0
2b) c)
4*a-2*b+4=0 ==> 2a-b=-2
16*a+4*b+4=0==>4a+b=-1
2d) On additionne les 2 équations membres à membre:
6a=-3 ==>a=-1/2
b=-1-4*a=-1-4*(-1/2)=-1+2=1
f(x)=-x²/2+x+4