Question

Rezolvare completa va rog.
Urgent

Answer 1

/7x+21/ x+2/=  /x+3/5, x≠-2
5(7x+21)=(x+3)×(x+2)
5(7x+21)-(x+3)×(x+2)=0
35x+105-(x²+2x+3x+6)=0
35x+105-(x²+5x+6)=0
35x+105-x²-5x-6=0
30x+99-x²=0
-x²+30x+99=0
x²-30x-99=0
x=-/(-30)plus minos √(-30)²-4×1×(-99)/tot supra 2×x
x=/30 plus minos √900+396 tot supra/2
x=/30 plus minos √1296/ tot supra2
x=30+36/ tot supra 2
x=30-36/ tot supra 2

x=33
x=-3, x≠2
x1=-3, x2=33............