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Qqun
@Qqun
April 2019
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Question qui me tracasse
dans une identité remarquable si a est négatif on a
(-a+b)² ca donne quoi aprés calcul
et comme ca
(-a-b)² ca donne quoi
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Verified answer
Salut,
(-a+b)² = (b-a)² et se développe pareil que (a-b)², sauf que les termes sont inversés:
(b-a)² = b² - 2ab + a² = a² - 2ab + b²
(-a-b)² = (-a + (-b))² = (-a)² + 2*(-a)(-b) + (-b)² = a² + 2ab + b²
Bonne journée !
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Verified answer
Salut,(-a+b)² = (b-a)² et se développe pareil que (a-b)², sauf que les termes sont inversés:
(b-a)² = b² - 2ab + a² = a² - 2ab + b²
(-a-b)² = (-a + (-b))² = (-a)² + 2*(-a)(-b) + (-b)² = a² + 2ab + b²
Bonne journée !