Réponses

2013-12-26T18:47:13+01:00
Bonsoir

D= (x+1)²+(2x+6)(2x-6)   
D = x² +2x +1 + 4x² - 12x + 12x  -36
D = 5x² +2x -35


 E= (x-2)(x+2)-5(x+2)      
E = x² +2x -2x -4 - 5x -10
E = x² -5x -14        


2013-12-26T18:48:32+01:00
D= (x+1)²+(2x+6)(2x-6)
=x²+2x+1+4x²-36
=5x²+2x-35
 
 E= (x-2)(x+2)-5(x+2)  
=x²-4-5x-10
=x²-5x-14