Question

(2x-1)^2-9=16 TÌM x ( 2 trường hợp)

Answer 1

\(\left(2x-1\right)^2-9=16\)

\(\Rightarrow\left(2x-1\right)^2=9+16=25\)

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

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

Answer 2

\(\Leftrightarrow\left(2x-1\right)^2=16+9=25\\ \Leftrightarrow\left[{}\begin{matrix}2x-1=5\\2x-1=-5\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=3\\x=-2\end{matrix}\right.\)