Question

x-2 tất cả mũ 2) -25=0

Answer 1

Ta có: \(\left(x-2\right)^2-25=0\)

\(\Leftrightarrow\left(x-2\right)^2=25\)

\(\Leftrightarrow\left[{}\begin{matrix}x-2=5\\x-2=-5\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=7\\x=-3\end{matrix}\right.\)

Vậy: \(x\in\left\{7;-3\right\}\)