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Sagot :

LUCIE1802

E= (2x-7)² - (5-x)²

 =[(2x-7) - (5-x)] x [(2x-7) + (5-x)]

 = (2x-7-5+x) x (2x-7+5-x)

= ( 3x -12) x ( x -2 )

LECHIM31270

 Bonjour,

 

E = (2x-7)² -(5-x)² = c'est de la forme a²-b² = (a+b)(a-b)

 

E = (2x-7+5-x)(2x-7-5+x)

 

E = (x-2)(3x-12)

 

J'espère que tu as compris

 

a+

 

 

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