Question

lg^2x=8-2lgx помогите

Answer 1

lg^2x + 2lgx - 8 = 0 
lgx = t

t^2  + 2t - 8 = 0 
D = 4 + 32 = 36
t1 = ( - 2 + 6)/2 = 2
t2 = ( - 2 -  6)/2 = - 4

lgx = 2 
x = 10^2
x = 100

lgx = - 4
нет решений

Ответ
100