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Rider2
@Rider2
May 2019
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Bonjour, j'ai ces 2 exo a faire pr demain et je ne comprend rien. merci du coup de main !
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Bonjour
A = ( 3 x + 1) ( x + 2) - 3 ( 3 x + 1)
= 3 x² + 6 x + x + 2 - 9 x - 3
=
3 x² - 2 x - 1
A = ( 3 x + 1) ( x + 2 - 3)
=
( 3 x + 1 ) ( x - 1)
A = - 1
3 x² - 2 x - 1 = - 1
3 x² - 2 x = - 1 + 1
3 x² - 2 x = 0
x = 0
A = 0
( 3 x + 1) ( x - 1) = 0
soit 3 x + 1 = 0 et x = - 1/3
soit x - 1 = 0 et x = 1
fais pareil pour le suivant, brevet dans 5 semaines !
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c'est pour demain merci d'avance
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Je ne trouve pas la longueur du segment ms, merci d'avance !
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Je ne sais pas comment faire, help
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Verified answer
BonjourA = ( 3 x + 1) ( x + 2) - 3 ( 3 x + 1)
= 3 x² + 6 x + x + 2 - 9 x - 3
= 3 x² - 2 x - 1
A = ( 3 x + 1) ( x + 2 - 3)
= ( 3 x + 1 ) ( x - 1)
A = - 1
3 x² - 2 x - 1 = - 1
3 x² - 2 x = - 1 + 1
3 x² - 2 x = 0
x = 0
A = 0
( 3 x + 1) ( x - 1) = 0
soit 3 x + 1 = 0 et x = - 1/3
soit x - 1 = 0 et x = 1
fais pareil pour le suivant, brevet dans 5 semaines !