Réponse:
bonjour
Explications étape par étape:
A = x² - 10x +25 -(x-5)(2x-3)
= x² - 2×1×5 + 5² -(x-5)(2x-3)
= (x - 5)² - (x-5)(2x-3)
= (x - 5)(x - 5 - (2x-3))
= (x - 5)(x - 5 -2x + 3)
= (x - 5)(-x - 2 )
B = (-x + 3 )2 - (x - 5 )2
= 2(-x +3 - (x - 5 ))
= 2(-x +3 -x + 5 )
= 2(-2x + 8)