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Ccddtt
@Ccddtt
May 2019
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Bonjour, je suis une élève de 2de, j'aurais besoin que vous m'aidiez pour faire cet exercice sil-vous-plaît, merci d'avance pour votre aide ;)
Développer et réduire l' expression suivante :
E=(7x+1)(7x-1)-(2x-1)²
Factoriser les expressions suivantes :
D=(5x+2)+4(2x+1)(5x-2)
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loulakar
Verified answer
Développer et réduire :
E = (7x+1)(7x+1)-(2x-1)^2
E = 49x^2+7x+7x+1-(4x^2-4x+1)
E = 49x^2 + 14x + 1 - 4x^2 - 4x + 1
E = 45x^2 + 10x + 2
Factoriser :
D = (5x-2)+4(2x+1)(5x-2)
D = (5x-2)(1+4(2x+1))
D = (5x - 2)(1 + 8x + 4)
D = (5x - 2)(8x + 5)
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Verified answer
Développer et réduire :E = (7x+1)(7x+1)-(2x-1)^2
E = 49x^2+7x+7x+1-(4x^2-4x+1)
E = 49x^2 + 14x + 1 - 4x^2 - 4x + 1
E = 45x^2 + 10x + 2
Factoriser :
D = (5x-2)+4(2x+1)(5x-2)
D = (5x-2)(1+4(2x+1))
D = (5x - 2)(1 + 8x + 4)
D = (5x - 2)(8x + 5)