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Thibaud2001
@Thibaud2001
April 2019
1
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On donne E=(2X-3)(X+2)-5(2X-3)
1) pour chaque valeur de X,calculer la valeur de E en précisant l'expression utiliser
a) X=0 b) X=-2 c) X=3 (en fait: 3 barre de fraction 2) d) X=3
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trudelmichel
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(2x-3)(x+2)-5(2x-3)=(2x-3)((x+2)-5)=(2x-3)(x-3)=2x^2-3x-6x+9=2x^2-9x+9
j'utilise l'expression E= 2x^2-9x+9
x=0 2x^2=0 9x=0 E=9
x=2 2x^2=2x4=8 9x=9*2=18 E=8-18+9=-1
x=3/2 2x^2=2*(3/2)^2= 2*9/4= 9/2 9x=9*3/2=27/2 E= 9/2-27/2+9=18/2+9=9+9=18
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Thanks 1
trudelmichel
2^2 veut dire 2 au carré ou 2 puissance 2
trudelmichel
*=x multiplié 2*3 veut dire 2x3 =6
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(2x-3)(x+2)-5(2x-3)=(2x-3)((x+2)-5)=(2x-3)(x-3)=2x^2-3x-6x+9=2x^2-9x+9j'utilise l'expression E= 2x^2-9x+9
x=0 2x^2=0 9x=0 E=9
x=2 2x^2=2x4=8 9x=9*2=18 E=8-18+9=-1
x=3/2 2x^2=2*(3/2)^2= 2*9/4= 9/2 9x=9*3/2=27/2 E= 9/2-27/2+9=18/2+9=9+9=18