Réponses

2013-04-04T20:40:30+02:00

(4X+5)(4X+5)=(9x-1)(9x-1)

16x²+20x+20x+25=81x²-9x-9x+1

16x²+40x+25=81x²-18x+1

16x²+40x+25-81x²+18x-1=0

-65x²+58x+24=0

Delta = 9604

x1=-4/13

x2=6/5