\(\left(x+1\right)^2=25\)
\(\Leftrightarrow\left[{}\begin{matrix}x+1=5\\x+1=-5\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x=4\\x=-6\end{matrix}\right.\)
Vậy \(x\in\left\{-6;4\right\}\)
#Ayumu
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