help equation '4X+5)(4X+5)=(9X-1)(9X-1)
Mathématiques
perrine48150
Question
help equation '4X+5)(4X+5)=(9X-1)(9X-1)
1 Réponse
-
1. Réponse guillaume59250
(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