Réponses

2014-01-25T11:13:42+01:00
(A+B)² = A²+2AB+B²
(A+B)² = (4x-5)²+2(4x-5)(1+3x)+(1+3x)²
(A+B)² = 16x²-40x+25 +2(4x+12x²-5-15x) + 1+6x+9x²
(A+B)² = 25x²-34x+26 +8x+24x²-10-30x
(A+B)² = 49x²-56x+16