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goodvibes
@goodvibes
January 2021
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Bonjour à tous pourriez vous m’aider pour c’est opération il faut factoriser je n’y arrive pas .
Merci à tous pour votre aide
1.(3x+6)(3x-8)-(4-7x)(-6-2)
2.(4-7x)(-3x-8)-(4-7x)(-6x-2)
3.(6x+2)(4x+3)+(5x+7)(4x+3)
Merci ❤️
Niveau 3ème
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maudmarine
Verified answer
Bonjour,
1.(3x+6)(3x-8)-(4-7x)(-6-2) -
On ne peut pas factoriser mais juste développer
= 9x² - 24x + 18x - 48 - (- 24 - 8 + 42x + 14x)
= 9x² - 24x + 18x - 48 + 24 + 8 - 42x - 14x
= 9x² - 24x - 42x - 14x + 18x - 48 + 24 + 8
= 9x² - 80x - 16
2.(4-7x)(-3x-8)-(4-7x)(-6x-2)
= (4 - 7x) [(- 3x - 8) - (- 6x - 2)]
= (4 - 7x) (- 3x - 8 + 6x + 2)
= (4 - 7x) (- 3x + 6x - 8 + 2)
= (4 - 7x) (3x - 6)
3.(6x+2)(4x+3)+(5x+7)(4x+3)
= (4x + 3) (6x + 2 + 5x + 7)
= (4x + 3) (6x + 5x + 2 + 7)
= (4x + 3) (11x + 9)
1 votes
Thanks 1
goodvibes
Merci bcp
mohamed20021
mais il n'a pas factoriser la premiere operation
maudmarine
Elle n'est pas factorisable !!!
mohamed20021
on peut la factoriser
goodvibes
Pourquoi ne peut on pas la factoriser?
mohamed20021
Oui on peut la factoriser
maudmarine
non
maudmarine
Tu as mal recopié ton énoncé
mohamed20021
oui mais comme on peut la factoriser
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Lista de comentários
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Bonjour,1.(3x+6)(3x-8)-(4-7x)(-6-2) - On ne peut pas factoriser mais juste développer
= 9x² - 24x + 18x - 48 - (- 24 - 8 + 42x + 14x)
= 9x² - 24x + 18x - 48 + 24 + 8 - 42x - 14x
= 9x² - 24x - 42x - 14x + 18x - 48 + 24 + 8
= 9x² - 80x - 16
2.(4-7x)(-3x-8)-(4-7x)(-6x-2)
= (4 - 7x) [(- 3x - 8) - (- 6x - 2)]
= (4 - 7x) (- 3x - 8 + 6x + 2)
= (4 - 7x) (- 3x + 6x - 8 + 2)
= (4 - 7x) (3x - 6)
3.(6x+2)(4x+3)+(5x+7)(4x+3)
= (4x + 3) (6x + 2 + 5x + 7)
= (4x + 3) (6x + 5x + 2 + 7)
= (4x + 3) (11x + 9)