Question

tìm x biết :(2x+1)^2=49

Answer 1

`(2x+1)^2=49`

`=> 2x+1=7` hoặc `2x+1=-7`

`=> 2x=6` hoặc `2x=-8`

`=> x=3` hoặc `x=-4`

Answer 2

\(\left(2x+1\right)^2=49\)

\(\Rightarrow\left(2x+1\right)^2=\left(\pm7\right)^2\)

TH1: \(2x+1=7\Rightarrow2x=6\Rightarrow x=3\)

TH2: \(2x+1=-7\Rightarrow2x=-8\Rightarrow x=-4\)