Répondre :
Développement
(−10x+7)−(4x−2)(−10x+7).
=-10x+7-(-40x²+28x+20x-14)
=-10x+7+40x²-28x-20x+14
=40x²-58x+21
Factorisation
(−10x+7)−(4x−2)(−10x+7).
=(−10x+7)(1-4x+2)
=(−10x+7)(3-4x)
(−10x+7)−(4x−2)(−10x+7).
=-10x+7-(-40x²+28x+20x-14)
=-10x+7+40x²-28x-20x+14
=40x²-58x+21
Factorisation
(−10x+7)−(4x−2)(−10x+7).
=(−10x+7)(1-4x+2)
=(−10x+7)(3-4x)