Réponses

2014-02-01T22:43:52+01:00
A = (x-3)² + x (x+5)
= x
²-6x+9 + x² + 5x
= 2x² - x + 9 

B = (2x+3)² -2(x-5)²
= 4x² + 12x + 9 - 2 (x² - 10x + 25)
=  4x² + 12x + 9 - 2x² + 20x - 50
= 2x² + 36x - 41