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clarinete54
@clarinete54
January 2021
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Bonjour je suis en troisième et je dois donner la forme factorisée de l'expression (7x + 2)^2 - 25
Pouvez vous m'aider ?
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Aftershock
(7x+2)²-25 est de la forme a²-b² avec a =
(7x+2) et b = 5
((7x+2)-5)(
(7x+2)+5) = (7x-3)(7x+7)
0 votes
Thanks 1
nonotata
Bonsoir
(7x+2)²-25
(7x+2)²-5²
(7x+2-5)(7x+2+5)
(7x-3)(7x+7)
7(7x-3)(x+1)
2 votes
Thanks 3
clarinete54
Le résultat ne serait pas (7x-3) (-7x-7)
nonotata
non pourquoi pense tu qu'il y ait un moin dans la 2eme parenthese ?
clarinete54
A non c'est moi j'ai compris merci de ton aide :)
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((7x+2)-5)((7x+2)+5) = (7x-3)(7x+7)
(7x+2)²-25
(7x+2)²-5²
(7x+2-5)(7x+2+5)
(7x-3)(7x+7)
7(7x-3)(x+1)