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Lucie11058
@Lucie11058
April 2019
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AIDEZ MOI SVP !!!
On donne l’expression E(x) = 9-(2x-1)²
a) Développer et réduire E(x)
b) Factoriser E(x)
c) Calculer E(x) pour x =
1
2
d) Résoudre l'équation E(x) = 0
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Omnes
Salut,
E(x) = 9-(2x-1)²
a)
E(x) = 9 - (4x² - 4x + 1 )
E(x) = 9 - 4x² + 4x - 1
E(x) = -4x² + 4x + 8
b)
E(x) = 9-(2x-1)²
E(x) = 3² - (2x-1)²
E(x) = (3-(2x-1))(3+(2x-1))
E(x) = (3-2x+1)(3+2x-1)
E(x) = (4-2x)(2+2x)
--> Bonus (niveau 1ère) :
E(x) = (4-2x)(2+2x)
E(x) = 4(2-x)(1-x)
c)
E(1/2) =
(4-2*(1/2) )(2+2*(1/2))
= (4-1)(2+1) = 3*3 = 9
d)
E(x) = 0
(4-2x)(2+2x) = 0
4-2x = 0
-2x = -4
x = -4/(-2) = 2
2 + 2x = 0
2x = 2
x = 1
Bonne journée !
1 votes
Thanks 1
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Lista de comentários
E(x) = 9-(2x-1)²
a)
E(x) = 9 - (4x² - 4x + 1 )
E(x) = 9 - 4x² + 4x - 1
E(x) = -4x² + 4x + 8
b)
E(x) = 9-(2x-1)²
E(x) = 3² - (2x-1)²
E(x) = (3-(2x-1))(3+(2x-1))
E(x) = (3-2x+1)(3+2x-1)
E(x) = (4-2x)(2+2x)
--> Bonus (niveau 1ère) :
E(x) = (4-2x)(2+2x)
E(x) = 4(2-x)(1-x)
c)
E(1/2) = (4-2*(1/2) )(2+2*(1/2))= (4-1)(2+1) = 3*3 = 9
d)
E(x) = 0
(4-2x)(2+2x) = 0
4-2x = 0
-2x = -4
x = -4/(-2) = 2
2 + 2x = 0
2x = 2
x = 1
Bonne journée !