developper reduire D= (2x+5)² = (3-x)(x-2)
(2x+5)²=4x²+20x+25
si (2x+5)² = (3-x)(x-2) alors
4x²+20x+25=5x-x²-6
5x²+15x+31=0
D= (2x+5)² = (3-x)(x-2)
=4x²+20x+25 = 3x -6 -x² + 2x
=4x²+20x+25=-x²+5x-6
