Réponses

  • Utilisateur Brainly
2013-03-12T21:11:25+01:00

A = (x-1)² - (2x-3)²

 = (x² - x *2 *1 +1²) - (2x² - 2x*3*2+3²)

 = x² -2x +1 - (4x² - 12x +9)

 = x² -2x +1 - 4x² +12x -9

 = -3x² + 10x - 8

 

x² ( -3 + 10/x - 8/x²)