Question

(2x+1)^2=36/25

Answer 1

=>2x+1=6/5 hoặc 2x+1=-6/5

=>2x=1/5 hoặc 2x=-11/5

=>x=1/10 hoặc x=-11/10

Answer 2

`(2x+1)^2=36/25`

`=> (2x+1)^2=(6/5)^2`

`=> 2x+1=+- 6/5`

\(\Rightarrow\left[{}\begin{matrix}2x+1=\dfrac{6}{5}\\2x+1=-\dfrac{6}{5}\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}2x=\dfrac{1}{5}\\2x=\dfrac{-11}{5}\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{1}{5}\times\dfrac{1}{2}\\x=-\dfrac{11}{5}\times\dfrac{1}{2}\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{1}{10}\\x=\dfrac{-11}{10}\end{matrix}\right.\)