Question

\(|4+2x|=-4x\)

Answer 1

|4+2x| = -4x

=> x \(\le\) 0

TH1: x = 0

<=> |4+2x| = -4x

<=>4 + 0 = 0

=> vô nghiệm

TH2: x < 0

=>th1:x < -2

<=> |4+2x| = -4x

<=> - 4 - 2x = -4x

<=> - 4 = -2x

<=> 2 = x

th2: -2 < x < 0

<=> |4+2x| = -4x

<=> 4 + 2x = -4x

<=> 4 = - 6x

<=> x = -2/3

Answer 2

-Pt <=> 4+2x=-4x hoặc -(4+2x)=4x

<=> x=\(-\dfrac{1}{3}\) (tmđk) hoặc x=2 (ktmđk)