bonjour factoriser les expression suivante C=2x²-x D=4x-16 E=x²-14x+49 F=6x+14+(3x+7)² G=(3x+5)²-(x-8)² H=(x-7)(x+1)+(x+1)(x+2) merci d'avance

bjr

C=2x²-x

  = 2*x*x - 1*x

   = x (2x - 1)

D=4x-16

  = 4*x - 4*4

  = 4 (x-4)

E=x²-14x+49

  = (x-7)²      puisque (a-b)² = a² - 2ab + b²

F=6x+14+(3x+7)²

 = 2 (3x+7) + (3x+7) (3x+7)

  = (3x+7) (2 + 3x + 7) tu finis

G=(3x+5)²-(x-8)²

 = (3x+5+ (x-8)) (3x+5 - (x-8))  tu finis   a² - b² = (a+b) (a-b)

H=(x-7)(x+1)+(x+1)(x+2)

 = (x+1) (x-7 + x+2)

tu finis

bonjour

C = x ( 2 x - 1 )

D = 4 ( x - 4 )

E = ( x - 7 )²

F =  2 ( 3 x + 7) + ( 3 x + 7 )²   =  ( 3 x + 7 ) ( 2 + 3 x + 7 ) = ( 3 x + 7 ) ( 3 x + 9 )

G = ( 3 x + 5 + x - 8 ) ( 3 x + 5 - x + 8) = ( 4 x - 3 ) ( 2 x + 13 )

H = (  x + 1 ) ( x - 7 + x + 2 ) = ( x + 1 ) ( 2 x - 5 )