Question

Giúp mình với ạ cảm ơn mn nhìu

Answer 1

\(\Leftrightarrow\sqrt{\left(x-2\right)^2}=7\)

\(\Leftrightarrow\left|x-2\right|=7\)

\(\Leftrightarrow\left[{}\begin{matrix}x-2=7\\x-2=-7\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=9\\x=-5\end{matrix}\right.\)

Answer 2

Ta có: \(\sqrt{x^2-4x+4}-5=2\)

\(\Leftrightarrow\left|x-2\right|=7\)

\(\Leftrightarrow\left[{}\begin{matrix}x-2=7\\x-2=-7\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=9\\x=-5\end{matrix}\right.\)