Question

2) ||X| + 2) = 7.
помогите​

Answer 1

||х|+2|=7

[ |х|+2=7

[ |х|+2=-7

[ |х|=5

[ |х|=-9

[х=5

[х=-5

[х∈Ø

[х=-5

[х=5

Ответ: {-5; 5}