Réponses

2013-12-27T20:58:51+01:00
4x²-4x+1+(x+5)(2x-1)
=(2x-1)²+
(x+5)(2x-1)
=(2x-1)(2x-1)+(x+5)(2x-1)
=(2x-1)(2x-1+x+5)
=(2x-1)(3x+4)
2013-12-27T21:36:11+01:00
4x²-4x+1 est de la forme (a - b)² = a² - 2ab + b²
4x²-4x+1 = (2x-1)(2x-1)
4x²-4x+1+(x+5)(2x-1) = (2x-1)(2x-1) + (x+5)(2x-1) = (2x-1)(2x-1+x+5) = (2x-1)(3x+4)