Sagot :
Réponse :
A= 4x -x =
x(4-1) = 3x
B = 3xy - 6x²=
3x(y-2x)
C= 1- 9x²= a²-b² =
(1-3x)(1+3x)
D x²-20-5 =
x²-25=a²-b²=
(x-5)(x+5)
E= (2x - 3)² - 49 =a²-b²=
(2x-3-7)(2x-3+7) =(
2x-10)(2x+4) =
4(x-5)(x+2)
F: (x+1) (2x-5) - (x+1) (x-5)=
(x+1)(2x-5-x-1) =
(x+1)(x-6)
G= x² + 2x - 3x²=
-2x²+2x=
2x(-x+1)
Explications étape par étape
bonjour
A = x ( 4 - 1 )
B = 3 x ( y - 2 x )
C = ( 1 - 3 x ) ( 1 + 3 x )
D = x² - 25 = ( x - 5 ) ( x + 5 )
E = ( 2 x - 3 - 7 ) ( 2 x - 3 + 7 ) = ( 2 x - 10 ) ( 2 x + 4 )
F = ( x +1 ) ( 2 x - 5 - x + 5 ) = ( x + 1 ) ( x )
G = x ( x + 2 - 3 x )