bonjour j arrive pas cette exercise
Question
1 Réponse
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1. Réponse maudmarine
Bonjour,
B = 4x² - 20x + 25 = 0
B = (2x - 5)² = 0
2x - 5 = 0
2x = 5
x = 5/2
x = 2,5
C = (2x + 1)² - (x + 1)² = 0
C = [(2x + 1) - (x + 1)] [(2x + 1) + (x + 1)] = 0
C = (2x + 1 - x - 1) (2x + 1 + x + 1) = 0
C = x (3x + 2) = 0
x = 0 ou 3x + 2 = 0
3x = - 2
x = - 2/3
D = x² - 6x + 9 = 0
D = (x - 3)² = 0
x - 3 = 0
x = 3
E = (2x + 1)² - 25 = 0
E = (2x + 1)² - 5² = 0
E = (2x + 1 - 5) (2x + 1 + 5) = 0
E = (2x - 4) (2x + 6) = 0
2x - 4 = 0 ou 2x + 6 = 0
2x = 4 2x = - 6
x = 4/2 x = - 6/2
x = 2 x = - 3
Je te laisse continuer.