Réponses

  • Utilisateur Brainly
2013-03-07T22:41:21+01:00

= (2x-5)(x+7)-(x+9)(7x-2)

= (2x2+14x-5x+35)-(7x2-2x+63x+18)

= 2x2+9x+35-7x2-61x+18

= 9x2 - 52x + 53

2013-03-07T22:57:47+01:00

A= (2x-5)(x+7)-(x+9)(7x-2)

A= (2x2+14x-5x+35)-(7x2-2x+63x+18)

A= 2x2+9x+35-7x2-61x+18

A= 9x2 - 52x + 53