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ENZKACZMAREK
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Bonjour, j’ai besoin d’aide sur un devoir et j’ai du mal à le faire ,
Exercice 1 (9 points) : Factoriser les expressions suivantes.
A = 7x - 7y
B = 3x + 27
C = x² - 2x
D = x² - 49
E = 25x²-16
F = (3x – 1)²– 36
merci d’avance

Sagot :

NBA10

Réponse :

bonjour,

A = 7x - 7y = 7 ( x - y )  

B = 3x + 27 = 3 ( x + 9 )

C = x² - 2x = x ( x -2 )  

D = x² - 49 = x² - 7² = ( x + 7) ( x - 7 )  

E = 25x²-16 = 25x² - 4² = ( 5x - 4 ) ( 5x + 4)  

F = (3x – 1)²– 36 = (3x – 1)² - 6 ² = ( (3x – 1) - 6)( (3x – 1) + 6)

= ( 3x - 1 -6)( 3x -1 + 6) = ( 3x - 7) ( 3x + 5)

voila :)

GABI777

Réponse :

A = 7x - 7y

A = 7 ( x - y )  

B = 3x + 27

B = 3 ( x + 9 )

C = x² - 2x

C = x ( x - 2 )  

D = x² - 49

D = x² - 7²

D = ( x + 7) ( x - 7 )  

E = 25x²-16

E = 25x² - 4²

E = ( 5x - 4 ) ( 5x + 4)  

F = (3x - 1)²- 36

F = (3x - 1)² - 6 ²

F = ( 3x - 1 - 6)( 3x - 1 + 6)

F = ( 3x - 7 )( 3x + 5)

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