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aureliagrasset
@aureliagrasset
January 2021
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Bonjours tous le monde, Ex 132 p 96 du livre phare 3eme
Mercii de m'aider.
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fransey
Bonjour,
1)
a)
Développer puis réduire l expression H
H = (x - 4)² - x (x - 10)
H = x² - 8x + 16 - x² + 10x
H = 2x + 16
b)
Résoudre léquation H = 16
H = 2x + 16 = 16
H = 2x = 16 - 16
H = 2x = 0
2) On pose I = (7x - 3)²- 5²
a)
Factoriser l expression I
I = (7x - 3)² - 5²
I = (7x - 3 - 5) (7x - 3 + 5)
I = (7x - 8) (7x + 5)
b)
Résoudre l équation I = 0
(7x - 8) (7x + 5)
7x - 8 = 0 ou 7x + 5 = 0
7x = 8 ou 7x = - 5
x = 8/7
ou
x = - 5/7
0 votes
Thanks 1
maudmarine
Verified answer
H = (x-4)² - x(x-10)
H = (x-4)(x-4) - x(x-10)
H = x² -4x -4x + 16 - x² + 10x
H = 2x + 16
H = 16
2x+16 = 16
x = 0
I = (7x-3)² - 5²
I= (7x-3-5)(7x-3+5)
I = (7x - 8) ( 7x + 2)
I=o
(7x-8) = 0 ou (7x+2) =0
7x = 8 7x = -2
x = 8/7 x = -2/7
1 votes
Thanks 1
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Lista de comentários
1)
a) Développer puis réduire l expression H
H = (x - 4)² - x (x - 10)
H = x² - 8x + 16 - x² + 10x
H = 2x + 16
b) Résoudre léquation H = 16
H = 2x + 16 = 16
H = 2x = 16 - 16
H = 2x = 0
2) On pose I = (7x - 3)²- 5²
a) Factoriser l expression I
I = (7x - 3)² - 5²
I = (7x - 3 - 5) (7x - 3 + 5)
I = (7x - 8) (7x + 5)
b) Résoudre l équation I = 0
(7x - 8) (7x + 5)
7x - 8 = 0 ou 7x + 5 = 0
7x = 8 ou 7x = - 5
x = 8/7 ou x = - 5/7
Verified answer
H = (x-4)² - x(x-10)H = (x-4)(x-4) - x(x-10)
H = x² -4x -4x + 16 - x² + 10x
H = 2x + 16
H = 16
2x+16 = 16
x = 0
I = (7x-3)² - 5²
I= (7x-3-5)(7x-3+5)
I = (7x - 8) ( 7x + 2)
I=o
(7x-8) = 0 ou (7x+2) =0
7x = 8 7x = -2
x = 8/7 x = -2/7