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1. (lgx+5) * lgx+ 15+3lgx
2. log(2) (x+1)+ log(2) (x+3) =3
1. (lgx+5) * lgx+ 15+3lgx
2. log(2) (x+1)+ log(2) (x+3) =3
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log(2)((x+1)(x+3))=3
(x+1)(x+3)=2^3=8
x^2+4x-5=0
D=16+20=36
x1=(-4+6)/2=1
x2=(-4-6)/2=-5 не подходит по ОДЗ
Ответ: х=1