Sagot :
(2x+5)(3x-1)
= 6x^2 - 2x + 15x - 5
= 6x^2 + 13x - 5
(x-1)^2 +x ^2+(x+1)^2
= x^2 -2x + 1 + x^2 + x^2 + 2x + 1
= 3x^2 + 2
D = 6x²-2x+15x-5 = 6x²+13x-5
E = (x-1)² + x² + (x+1)² = x²-2x+1+x²+x²+2x+1 = 3x² +2
bonjour puvez vous m aider pour dévelopé et réduire D=(2x+5)(3x-1) et E=(x-1)au carré+x au carré+(x+1) au carré
(2x+5)(3x-1)
= 6x^2 - 2x + 15x - 5
= 6x^2 + 13x - 5
(x-1)^2 +x ^2+(x+1)^2
= x^2 -2x + 1 + x^2 + x^2 + 2x + 1
= 3x^2 + 2
D = 6x²-2x+15x-5 = 6x²+13x-5
E = (x-1)² + x² + (x+1)² = x²-2x+1+x²+x²+2x+1 = 3x² +2