=>x-3=5 hoặc x-3=-5
=>x=-2 hoặc x=8
\(\left(x-3\right)^2=25\\ \left(x-3\right)^2=5^2\\ x-3=5\\ x=5+3\\ x=8\)
\(\left(x-3\right)^2=25\)
\(\left(x-3\right)^2=5^2\) hoặc \(\left(-5\right)^2\)
\(=>x-3=5\) hoặc \(x-3=-5\)
Nếu \(x-3=5=>x=8\)
Nếu \(x-3=-5=>x=-2\)
\(=>x\in\left\{8;-2\right\}\)
\(\left(x-3\right)^2=25\)
\(\Rightarrow\left(x-3\right)^2=\left(\pm5\right)^2\)
\(\Rightarrow\left[{}\begin{matrix}x-3=5\\x-3=-5\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}x=8\\x=-2\end{matrix}\right.\)
Vậy \(x\in\left\{8;-2\right\}\)
