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TheoM999
@TheoM999
May 2019
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Aider moi svp c'est pour demain
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gsantha
Verified answer
F(x) = 5x² - 4x + 3
Pour calculer l'image d'une fonction, il te suffit simplement de remplacer x par les nombres demandés :
a) image de 2
p(2) = 5 * 2² - 4 * 2 + 3
= 5 * 4 - 8 + 3
= 20 - 5
= 15
b) image de -3
p(-3) = 5 * (-3)² - 4 * (-3) + 3
= 5 * 9 + 12 + 3
= 45 + 15
= 60
c) image de 2 / 3
p(2 / 3) = 5 * (2 / 3)² - 4 * (2 / 3) + 3
= 5 * (2² / 3²) - (4 * 2) / 3 + 3
= 5 * (4 / 9) - 8 / 3 + 3
= (5 * 4) / 9 - 8 / 3 + (3 * 3) / (1 * 3)
= 20 / 9 - 8 / 3 + 9 / 3
= 20 / 9 + (-8 + 9) / 3
= 20 / 9 + 1 / 3
= 20 / 9 + (1 * 3) / (3 * 3)
= 20 / 9 + 3 / 9
= (20 + 3) / 9
= 23 / 9
Tu fais de même pour 0 et 1.4 et tu dois trouver :
p(0) = 3
p(1.4) = 7.2
Voilà j'espère avoir pu t'aider ^^
1 votes
Thanks 1
loulakar
Verified answer
Bonjour,
p(x) = 5x^2 - 4x + 3
p(2) = 5 * 2^2 - 4 * 2 + 3
p(2) = 5 * 4 - 8 + 3
p(2) = 20 - 5
p(2) = 15
p(-3) = 5 * (-3)^2 - 4 * (-3) + 3
p(-3) = 5 * 9 + 12 + 3
p(-3) = 45 + 15 = 60
p(2/3) = 5 * (2/3)^2 - 4 * (2/3) + 3
p(2/3) = 5 * 4/9 - 8/3 + 3
p(2/3) = 20/9 - 24/9 + 27/9
p(2/3) = (47 - 24)/9 = 23/9
p(0) = 5 * 0 - 4 * 0 + 3 = 3
p(1,4) = 5 * (1,4)^2 - 4 * 1,4 + 3
p(1,4) = 5 * 1,96 - 5,6 + 3
p(1,4) = 7,2
0 votes
Thanks 1
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Lista de comentários
Verified answer
F(x) = 5x² - 4x + 3Pour calculer l'image d'une fonction, il te suffit simplement de remplacer x par les nombres demandés :
a) image de 2
p(2) = 5 * 2² - 4 * 2 + 3
= 5 * 4 - 8 + 3
= 20 - 5
= 15
b) image de -3
p(-3) = 5 * (-3)² - 4 * (-3) + 3
= 5 * 9 + 12 + 3
= 45 + 15
= 60
c) image de 2 / 3
p(2 / 3) = 5 * (2 / 3)² - 4 * (2 / 3) + 3
= 5 * (2² / 3²) - (4 * 2) / 3 + 3
= 5 * (4 / 9) - 8 / 3 + 3
= (5 * 4) / 9 - 8 / 3 + (3 * 3) / (1 * 3)
= 20 / 9 - 8 / 3 + 9 / 3
= 20 / 9 + (-8 + 9) / 3
= 20 / 9 + 1 / 3
= 20 / 9 + (1 * 3) / (3 * 3)
= 20 / 9 + 3 / 9
= (20 + 3) / 9
= 23 / 9
Tu fais de même pour 0 et 1.4 et tu dois trouver :
p(0) = 3
p(1.4) = 7.2
Voilà j'espère avoir pu t'aider ^^
Verified answer
Bonjour,p(x) = 5x^2 - 4x + 3
p(2) = 5 * 2^2 - 4 * 2 + 3
p(2) = 5 * 4 - 8 + 3
p(2) = 20 - 5
p(2) = 15
p(-3) = 5 * (-3)^2 - 4 * (-3) + 3
p(-3) = 5 * 9 + 12 + 3
p(-3) = 45 + 15 = 60
p(2/3) = 5 * (2/3)^2 - 4 * (2/3) + 3
p(2/3) = 5 * 4/9 - 8/3 + 3
p(2/3) = 20/9 - 24/9 + 27/9
p(2/3) = (47 - 24)/9 = 23/9
p(0) = 5 * 0 - 4 * 0 + 3 = 3
p(1,4) = 5 * (1,4)^2 - 4 * 1,4 + 3
p(1,4) = 5 * 1,96 - 5,6 + 3
p(1,4) = 7,2