Question

Answer 1

\(x\in\left\{-8;8\right\}\) \(x\in\left\{-4,2;4,2\right\}\)

Answer 2

x thuộc nha bn

 

Answer 3

|x| = 8 thì x ∈ { -8; 8}

|x| = 4,2 thì x ∈ { -4,2; 4,2}