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Manooon17111
@Manooon17111
May 2019
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Bonjour j'ai besoin d'aide, 2nde
Soi la fonction f définie sur R par f(x) = 4x*2 - 5x + 3
Calculer les images de:
1) -5
2) 3 - V2
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nadiab
Bonjour,
f(x) = 4x² - 5x + 3
Calculer les images de:
1) -5
f(-5) = 4(-5)² - 5(-5) + 3
f(-5)= 128
2) 3 - V2
f(3-v2) = 4(3-v2)² - 5(3-v2) + 3
f(3-v2)= 4(3-v2)(3-v2)-15+5v2+3
= 4(9-3v2-3v2+v4)-15+5v2+3
= 36 -24v2+8-15+5v2+3
= 32 -19v2
2 votes
Thanks 1
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f(x) = 4x² - 5x + 3
Calculer les images de:
1) -5
f(-5) = 4(-5)² - 5(-5) + 3
f(-5)= 128
2) 3 - V2
f(3-v2) = 4(3-v2)² - 5(3-v2) + 3
f(3-v2)= 4(3-v2)(3-v2)-15+5v2+3
= 4(9-3v2-3v2+v4)-15+5v2+3
= 36 -24v2+8-15+5v2+3
= 32 -19v2