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Rethorelea
@Rethorelea
April 2019
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Bonjour pourriez vous m'aider pour se devoir maison, je suis vraiment bloquer surtout pour l'exercice 2. Merci d'avance
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laurance
Exercice 2
en développant identité remarquable (a+b)²
(3x+1)² - 6x - 5 = 0
9x² + 6x + 1 - 6x - 5 = 0
9x² = 4
x² = 4/9 x = 2/3 ou x = - 2/3 deux solutions
en factorisant identité remarquable a² - b²
[ 5(x-2)]² - (3x)² = 0
[ 5(x-2) - 3x ] [ 5(x-2) + 3x] = 0
(2x -10)(8x - 10 )= 0 2x = 10 ou 8x = 10
x = 10/2 = 5 ou x =10/8 = 5/4 deux solutions
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en développant identité remarquable (a+b)²
(3x+1)² - 6x - 5 = 0
9x² + 6x + 1 - 6x - 5 = 0
9x² = 4
x² = 4/9 x = 2/3 ou x = - 2/3 deux solutions
en factorisant identité remarquable a² - b²
[ 5(x-2)]² - (3x)² = 0
[ 5(x-2) - 3x ] [ 5(x-2) + 3x] = 0
(2x -10)(8x - 10 )= 0 2x = 10 ou 8x = 10
x = 10/2 = 5 ou x =10/8 = 5/4 deux solutions