factoriser l'expression A= (5x-4)²-(5x-4)(2x-2)
A = (5x-4)(5x-4)-(2x-2)
= (5x-4)(5x-4-2x+2)
= (5x-4)(3x-2)
A = (5x - 4)² - (5x - 4)(2x - 2)
= (5x - 4) [(5x - 4) - (2x - 2)]
= (5x - 4) (5x - 4 - 2x + 2)
= (5x - 4)(3x - 2)
