Question

Решите неравенство $49^{x+1} leq ( frac{1}{7} ) ^{x}$

Answer 1

$49^{x+1}leqleft(dfrac{1}{7}right)^x\ 7^{2(x+1)}leq7^{-x}\ 2(x+1)leq-x\ 2x+2leq-x\ 3xleq-2\ xleq-dfrac{2}{3}$