Question

giải pt \(\left|2x+1\right|=3\)

Answer 1

TH1: 2x + 1 = 3

\(\Leftrightarrow2x=2\Leftrightarrow x=1\)

TH2: 2x + 1 = -3

\(\Leftrightarrow2x=-4\Leftrightarrow x=-2\)

KL: Vậy PT có nghiệm \(S=\left\{1;-2\right\}\)

Answer 2

\(\left|2x+1\right|=3\)

\(2x+1=3\)

\(2x+1=-3\)

\(x=1\)

\(x=-2\)

\(x_1=-2,x_2=1\)