Question

(2x + 1)² = 25

Answer 1

\(\Leftrightarrow\left[{}\begin{matrix}2x+1=5\\2x+1=-5\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=2\\x=-3\end{matrix}\right.\)

Answer 2

=>2x+1=5 hoặc 2x+1=-5

=>2x=4 hoặc 2x=-6

=>x=2 hoặc x=-3

Answer 3

(2x + 1)² = 25

=> \(\left[{}\begin{matrix}2x+1=5\\2x+1=-5\end{matrix}\right.=>\left[{}\begin{matrix}2x=4\\2x=-6\end{matrix}\right.=>\left[{}\begin{matrix}x=2\\x=-3\end{matrix}\right.\)

Answer 4

\(\sqrt{\left(2x+1\right)^2}=\sqrt{25}\)

\(2x+1=5\)

\(2x=4\)

\(x=2\)

Answer 5

Answer 6

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

`=>`\(\left[{}\begin{matrix}\left(2x+1\right)^2=5^2\\\left(2x+1\right)^2=-5^2\end{matrix}\right.\)

`=>`\(\left[{}\begin{matrix}2x+1=5\\2x+1=-5\end{matrix}\right.\)

`=>`\(\left[{}\begin{matrix}2x=4\\2x=-6\end{matrix}\right.\)

`=>`\(\left[{}\begin{matrix}x=2\\x=-3\end{matrix}\right.\)