Question

rezolva ecuatia $lg^2x - 3 lg x + 2 = 0$

Answer 1

conditia  x>0
Faci  lgx=y
ECuatia  devine
y²-3y+2=0
y1=1=>  lgx=1=>x=10
y2=2   lgx=2=.>x=100
S={10,100}