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Morgaaneeuh
@Morgaaneeuh
April 2019
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Bonsoir ,
Niveau 4e
Calculer les expressions suivantes pour x =-4
5+4x
5(-3x-11)
x(x+7)
(3x+15)²
5x²+20x+2
Merci beaucoup de votre aide ...
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loiselol97
1 er reponse 5+4x
2= -6-3x
3=8x
4= 3x+15au carré
5= 45x+2
0 votes
Thanks 0
dzoidzoi
5+4(-4) = 5-16 = -11
5(-3(-4)-11) = 5(12-11) = 5*1 =5
-4(-4+7) = -4(3) = -12
(3x+15)² = (3*(-4) +15)² = (-12+15)² = 3² = 9
5*(-4)² +20(-4) +2 = 5*16 -80 +2 = 80-80+2 =2
1 votes
Thanks 1
Morgaaneeuh
Merci , mais le deuxieme ne dois pas etre le bon ....
Morgaaneeuh
dans mon livre il y a un mots aformer et ce mot est bravo , du coup comme il y a deux 5 sa ne peux pas marcher
Morgaaneeuh
ahh oui merci beaucoup !!
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2= -6-3x
3=8x
4= 3x+15au carré
5= 45x+2
5(-3(-4)-11) = 5(12-11) = 5*1 =5
-4(-4+7) = -4(3) = -12
(3x+15)² = (3*(-4) +15)² = (-12+15)² = 3² = 9
5*(-4)² +20(-4) +2 = 5*16 -80 +2 = 80-80+2 =2