Question

tìm x biết 

\(\left(2x-3\right)\) \(^2\) = 25

Answer 1

Answer 2

Ta có: \(\left(2x-3\right)^2=25\)

\(\Leftrightarrow\left[{}\begin{matrix}2x-3=5\\2x-3=-5\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}2x=8\\2x=-2\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=4\\x=-1\end{matrix}\right.\)