Question

Am nevoie de ajutor la ecuația logaritmica, va rog!

Answer 1

lg²x-3lgx+2=0;  x>0

notam y=lgx;   y>0

=> y²-3y+2=0

Δ=9-8=1

y1=(3+1)/2=2 => lgx=2=> x=10²=100

y2=(3-1)/2=1 => lgx=1 => x=10

x∈{10; 100}