Question

Tìm x biết 

|3x-1|=4

Answer 1

vậy 3x-1=4 hoặc 3x-4=-4

\(TH1:3x-1=4\\ 3x=4+1=5\\ x=5:3\\ x=\dfrac{5}{3}\)

\(TH2:3x-1=-4\\ 3x=-4+1=-3\\ x=-3:3\\ x=-1\)

vậy \(x\in\left\{\dfrac{5}{3};-1\right\}\)