Réponses

2013-05-23T22:12:08+02:00

112/

 

a/ (3x+1)²

(3x+1)(3x+1)

9x²+3x+3x+1

9x²+6x+1

 

b/(7-x)²

(7-x)(7-x)

49-7x-7x+x²

x²-14x+49

 

c/(9-5x)(9+5x)

81+45x-45x-25x²

-25x²+81

2013-05-23T22:21:06+02:00