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Manon290915
@Manon290915
May 2019
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Bonjour, j'ai un exercice a faire.. Mais je n'y arrive pas.. Une personne pour m'aider svp? PS : Je suis en seconde.
On définit sur R la fonction f par f(x) = x2-2x-3 ("x2" signifie x au carré)
1/ Démontrer que f(x) = (x+1)(x-3)
2/ Démontrer que f(x) = (x-1)2 - 4 ("(x-1)2" signifie (x-1) au carré)
Merci d'avance.
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nadiab
Bonjour,
1)
f(x) = (x+1)(x-3)
f(x)= x²+x-3x-3
f(x)= x²-2x-3
2)
f(x) = (x-1)² - 4 (x-1)²
f(x)= x²-2x+1-4(x²-2x+1)
f(x)= x²-2x+1-4x²+8x-4
f(x)= -3x²+6x-3
1 votes
Thanks 1
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Bonjour, j'ai cet exo a faire qui pour m'aider svp? Au moins pour la 1)a) et la 3) svp merci.
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Bonsoir, qui pour m'aider pour le d) et le e) Svp?
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1)
f(x) = (x+1)(x-3)
f(x)= x²+x-3x-3
f(x)= x²-2x-3
2)
f(x) = (x-1)² - 4 (x-1)²
f(x)= x²-2x+1-4(x²-2x+1)
f(x)= x²-2x+1-4x²+8x-4
f(x)= -3x²+6x-3