Question

x^2=4

giúp mik với

Answer 1

x² = 4 suy ra x = 2

Answer 2

\(x^2=4\)

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

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

Answer 3

\(x=\pm2\)