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Math1404
@Math1404
May 2019
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Bonjour, comment factoriser
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ferrarirouge
Bonjour,
9x^2 - 25 +6x +10
= 9x^2 +6x - 15
= (3x+1)^2 -16
= (3x+1)^2 - 4^2 on reconnaît a^2-b^2 identité remarquable
= (3x+1+4) ( 3x +1-4)
= ( 3x +5) (3x-3)
on vérifie :
(3x +5)(3x-3)
= 9x^2 -9x +15x -15
= 9x^2 +6x -15
1 votes
Thanks 1
Math1404
merci mais on devrait pas trouvé +10en vérifiant ?
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9x^2 - 25 +6x +10
= 9x^2 +6x - 15
= (3x+1)^2 -16
= (3x+1)^2 - 4^2 on reconnaît a^2-b^2 identité remarquable
= (3x+1+4) ( 3x +1-4)
= ( 3x +5) (3x-3)
on vérifie :
(3x +5)(3x-3)
= 9x^2 -9x +15x -15
= 9x^2 +6x -15