Lg(x^2-5x+68)=2(lg16-lg2)

lg16-lg2=lg16/2=lg8   lg(a/b)=lga-lgb lg(x^2-5x+68)=lg8^2 2lg8=lg8^2 x^2-5x+68=64 x^2-5x+4=0 x=(5+-√(25-16))/2 x=(5+-3)/2 x1=(5-3)/2=1 x2=(5+3)/2=4