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Bonjour help pls c'est rapido
Exercice n°3 : Factoriser les expressions suivantes :
K=(2 x+5)(6 x+4)+(2x+5)(4 x+2)
L=(6 x+ 5)(4 x−3)+ (3 x−4)(4 x−3)
M=(4 x−2)²+ (4 x−2)(5 x+ 4)
N=(4 x+ 5)(2 x−3)−(4 x+ 5)(5 x+ 2)
P=(7 x+ 5)(2 x−4)−(5 x+ 2)(7 x+ 5)
Q=(4 x+ 5)²−(4 x+ 5)(7 x+ 3)


Répondre :

Bonsoir,

K=(2 x+5)(6x+4)+(2x+5)(4 x+2) 
K = (2x + 5) (6x + 4 + 4x + 2)
K = (2x + 5) (10x + 6)

L=(6 x+ 5)(4 x−3)+ (3 x−4)(4 x−3) 
L = (4x - 3) (6x + 5 + 3x - 4)
L = (4x - 3) (9x + 1)

M=(4 x−2)²+ (4 x−2)(5 x+ 4)
M = (4x - 2) (4x - 2 + 5x + 4)
M = (4x - 2) (9x + 2)

N=(4 x+ 5)(2 x−3)−(4 x+ 5)(5 x+ 2) 
N = (4x + 5) [(2x - 3) - (5x + 2)]
N = (4x + 5) (2x - 3 - 5x - 2)
N = (4x + 5) (- 3x - 5)

P=(7 x+ 5)(2 x−4)−(5 x+ 2)(7 x+ 5)
P = (7x + 5) [(2x - 4) - (7x + 5)]
P = (7x + 5) (2x - 4 - 7x - 5)
P = (7x + 5) (- 5x - 9)

Q=(4 x+ 5)²−(4 x+ 5)(7 x+ 3)
Q = (4x + 5) [(4x + 5) - (7x + 3)]
Q = (4x + 5) (4x + 5 - 7x - 3)
Q = (4x + 5) (- 3x + 2)