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84560
@84560
May 2019
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Bonjour j'ai un DM de mathématiques à faire pour mardi (je suis en seconde) sur les identités remarquables mais je bloque sur celle-ci :
(-4-7x)2 (carré)
Pouvez vous m'aider svp merci. Votre aide me sera très précieuse !
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chrystine
Verified answer
Bonsoir
(-4-7x)²
-4²-2*-4*7x+(7x)²
16+56x+49x²
49x²+56x+16
0 votes
Thanks 1
84560
Merci beaucoup
chrystine
de rien
84560
Et aussi petite question comment factorise-t-on 121-225x2 svp merci !
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Verified answer
Bonsoir(-4-7x)²
-4²-2*-4*7x+(7x)²
16+56x+49x²
49x²+56x+16