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Picorette
@Picorette
May 2019
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Bonjours,voici mon exercice de math que je n'arrive pas à faire.Si quelqu'un peut m'aider merci:)
Soit G = (2x – 8) (9x – 6).
1. Développez et réduisez G.
2. Calculez G pour x = 3.
3. Calculez G pour x = -2
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Verified answer
1. G = (2x-8)(9x-6)
G = 2x*9x + 2x*(-6) - 8*9x - 8*(-6)
G = 18x² - 12x - 72x + 48
G = 18x² - 84x + 48
2. x = 3
donc:
G = 18*(3)² - 84*3 + 48 = 18*9 - 252 + 48 = 162-204 = -42
ou
G = (2*3-8)(9*3-6) = (6-8)(27-6) = -2*21 = -42
3. x = -2
donc:
G = 18*(-2)² - 84*(-2) + 48 = 18*4 + 168 + 48 = 72 + 216 = 288
ou
G = (2*(-2)-8)(9*(-2)-6) = (-4-8)(-18-6) = -12*(-24) = 12*24 = 288
2 votes
Thanks 1
Commentaires
Verified answer
Bonjour,
1) G = (2x-8)(9x-6)
= 18x²-12x-72x+48
= 18x²-84x+48
2) si x=3, G = (2(3)-8)(9(3)-6) = (-2)(21) = -42
3) si x=-2, G = (2(-2)-8)(9(-2)-6) = (-12)(-24) = 288
1 votes
Thanks 1
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Bonjour J'ai du mal avec ces exercices (maths comme toujours :/ ) Je vous remercie a l'avance pour votre aide A=3 fois x +2 fois (5 fois x +2fois 8 ) Et B = 5 fois x fois x - 4 fois y fois y fois y + 15 fois x fois y - 3 fois x +2
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Verified answer
1. G = (2x-8)(9x-6)G = 2x*9x + 2x*(-6) - 8*9x - 8*(-6)
G = 18x² - 12x - 72x + 48
G = 18x² - 84x + 48
2. x = 3
donc:
G = 18*(3)² - 84*3 + 48 = 18*9 - 252 + 48 = 162-204 = -42
ou
G = (2*3-8)(9*3-6) = (6-8)(27-6) = -2*21 = -42
3. x = -2
donc:
G = 18*(-2)² - 84*(-2) + 48 = 18*4 + 168 + 48 = 72 + 216 = 288
ou
G = (2*(-2)-8)(9*(-2)-6) = (-4-8)(-18-6) = -12*(-24) = 12*24 = 288
Verified answer
Bonjour,1) G = (2x-8)(9x-6)
= 18x²-12x-72x+48
= 18x²-84x+48
2) si x=3, G = (2(3)-8)(9(3)-6) = (-2)(21) = -42
3) si x=-2, G = (2(-2)-8)(9(-2)-6) = (-12)(-24) = 288