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darina1312
@darina1312
June 2021
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Bonjour,
j'ai un DM de math basé sur trois exercices
Si quelqu'un pourrais m'aider ce serais très gentil
merci d'avance,
Consigne: factoriser chaque expressions en utilisant une identité remarquable
exercice n°1
a)x² + 16x + 64 b) 4x² - 20x + 25
exercice 2
a) 16x²-1 b) 4x² - 25
exercice 3
a) 9- x² b) (x+2)² - 49
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Geosmile
1)
a) x² + 16x + 64 = (x + 8)²
b) 4x² - 20x + 25 = (2x - 5)²
2)
a) 16x² - 1 = (4x - 1)(4x + 1)
b) 4x² - 25 = (2x - 5)(2x + 5)
3)
a) 9- x² = (3 - x)(3 + x)
b) (x + 2)² - 49 = ((x + 2) - 7)((x + 2) + 7) = (x - 5)(x + 9)
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a) x² + 16x + 64 = (x + 8)²
b) 4x² - 20x + 25 = (2x - 5)²
2)
a) 16x² - 1 = (4x - 1)(4x + 1)
b) 4x² - 25 = (2x - 5)(2x + 5)
3)
a) 9- x² = (3 - x)(3 + x)
b) (x + 2)² - 49 = ((x + 2) - 7)((x + 2) + 7) = (x - 5)(x + 9)