Question

Cứu ... Mai phải nộp rồi 😢😢😢😢😢😢

Answer 1

c: \(\Leftrightarrow x+2\in\left\{1;-1;3;-3;9;-9\right\}\)

hay \(x\in\left\{-1;-3;1;-5;7;-11\right\}\)