Question

Решите логарифмическое неравенство Log7 (x-1)<2

Answer 1

{x-1>0⇒x>1
{x-1<49⇒x<50
x∈(1;50)

Answer 2

ОДЗ: 
x>1

log(7) x-1<log(7) 49
x-1<49
x<50

(1;50)