Bhoutan j’ai besoin d aide merci d avance

Bonsoir,

a) 5x - 75
= 5*x - 5*15
= 5 (x - 15)

b) 16x² - 28
= 4*4x² - 4*7
= 4 (x² - 7)

c) (3x - 2)(5x + 7) - (3x - 2)(-8x + 3)
= (3x - 2)[5x + 7 - (-8x + 3)]
= (3x - 2)[5x + 7 + 8x - 3]
= (3x - 2)(13x + 4)

bonsoir =)

a = 5x - 75 
  = 5(x-15)

b = 16x² - 28
   =  4(4x² - 7) 

c = (3x -2)(5x+7) - (3x-2)(-8x + 3 )
   = (3x - 2 )( 5x + 7 + 8x - 3)
   = (3x - 2)(13x + 4)