Question

решите уравнение |-3х| = 3х

Answer 1

|-3х| = 3х

3|x| = 3x

x ≥ 0

3x = 3x

x∈[0, +∞)

x < 0

-3x = 3x

6x = 0

x = 0

ответ х ∈ [0, +∞)