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Smades
@Smades
January 2021
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Svp pouvez-vous m'aider ? Niveau 4 ème
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Ikramtout
Bonjour,
1) Développons E
=(7x)²-2*7x*2+2² -( 7x*3x+7x*1-2*3x-2*1)
= 49x²-28x+4-(21x²+7x-6x-2)
= 49x²-28x+4-21x²-x+2
= 28x²-29x+6
2) Factorisons E
= (7x-2)² - (7x-2) (3x+1)
= (7x-2) ( 7x-2) - ( ( 7x-2)(3x+1) )
= (7x-2) - ( ( 7x-2) - (3x+1) )
= (7x-2) ( 7x-2-3x-1)
= (7x-2) ( 4x-3)
3)
Soit x=1
= 28*1²-29*1+6
= 28-29+6
= -1+6
=5
Soit x= 2/7
= 28(2/7)²-29(2/7) +6
= (28*4)/49 - (29*2)/7 + 6/1
= 112/49 - 58/7 + (6*7)/(1*7)
= 16/7 - 58/7 + 42/7
= 0/7 =0
1 votes
Thanks 1
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Bonsoir, aidez-moi svp, merci. Cordialement Smades
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Bonsoir. Aidez moi svp c'est pour lundi, urgent !
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Aidez moi svp c'est pour lundi
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Lista de comentários
1) Développons E
=(7x)²-2*7x*2+2² -( 7x*3x+7x*1-2*3x-2*1)
= 49x²-28x+4-(21x²+7x-6x-2)
= 49x²-28x+4-21x²-x+2
= 28x²-29x+6
2) Factorisons E
= (7x-2)² - (7x-2) (3x+1)
= (7x-2) ( 7x-2) - ( ( 7x-2)(3x+1) )
= (7x-2) - ( ( 7x-2) - (3x+1) )
= (7x-2) ( 7x-2-3x-1)
= (7x-2) ( 4x-3)
3)
Soit x=1
= 28*1²-29*1+6
= 28-29+6
= -1+6
=5
Soit x= 2/7
= 28(2/7)²-29(2/7) +6
= (28*4)/49 - (29*2)/7 + 6/1
= 112/49 - 58/7 + (6*7)/(1*7)
= 16/7 - 58/7 + 42/7
= 0/7 =0