Question

Tìm x, biết: (x−5)²=64
 

Answer 1

\({\left( {x - 5} \right)^2} = 64 \Leftrightarrow {\left( {x - 5} \right)^2} = {8^2} \Leftrightarrow \left[ {_{x - 5 =  - 8}^{x - 5 = 8}} \right. \Leftrightarrow \left[ {_{x =  - 3}^{x = 13}} \right.\)

Vậy \(x \in \left\{ {13; - 3} \right\}\)