Question

(1/7)^(3х+1)≤49
помогите очень надо

Answer 1

(1/7)^(3х+1)≤49
(7⁻¹)³ˣ⁺¹≤7²
7⁻³ˣ⁻¹≤7²
7⁻³ˣ/7≤7²
7⁻³ˣ ≤ 7³
-3х≤3
х ≥ -1
х∈[-1 ;+∞)