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Exercice 11.X
Factoriser si possible :
A = (4x + 5)2 – 3x (4x + 5)
B = (6x – 1) (3x + 4) – (3x + 4)2
C = (7x – 5)2 – (x + 1) (7x – 5)

Sagot :

VINS

bonjour

A = ( 4 x + 5) ( 4 x + 5 - 3 x )

  = ( 4 x + 5 ) ( x + 5 )

B  = ( 3 x + 4 ) ( 6 x - 1 - 3 x - 4 )

  = ( 3 x + 4 ) ( 3 x - 5 )

c = ( 7 x - 5 ) ( 7 x - 5 - x - 1 )

  = ( 7 x - 5 ) ( 6 x - 6 )

 = 6 ( 7 x - 5 ) ( x - 1 )