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justine2399
@justine2399
June 2021
2
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S'il vous plaît aidez moi, je voudrais les étapes pour faire :
(5x+8)
²
-49
Vite s'il vous plaît.
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shanaclaes98
(5x+8)²-49
25x²+80x+64-49
25x²+80x+15
0 votes
Thanks 0
justine2399
ce n'est pas ça car ils mettent la réponse et c'est (5x+15)(5x+1) Mais j'aimerais savoir comment ils trouvent ça car j'ai un contrôle. Merci d'avance
droopette
(5x+8)²
-49
=[
(5x+8)+7][(5x+8)-7]
=(5x+15)(5x+1)
=5(x+3)(5x+1)
0 votes
Thanks 1
justine2399
merci droopette :)
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25x²+80x+64-49
25x²+80x+15
=[(5x+8)+7][(5x+8)-7]
=(5x+15)(5x+1)
=5(x+3)(5x+1)