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Meilleure réponse !
2012-05-01T19:50:11+02:00

(2x+5)²=4x²+20x+25

(3-x)(x-2)=3x-6-x²+2x=5x-x²-6

si (2x+5)² = (3-x)(x-2) alors

4x²+20x+25=5x-x²-6

5x²+15x+31=0

2012-05-01T19:51:46+02:00

D= (2x+5)² = (3-x)(x-2)

=4x²+20x+25 = 3x -6 -x² + 2x

=4x²+20x+25=-x²+5x-6