Question

x^2=4

=>x=?

Answer 1

\(x^2=4\)

\(V\text{ì}\)\(2^2=4\)

\(=>x=2\)

Answer 2

=> x=2

Answer 3

\(\hept{\begin{cases}x=2\\x=-2\end{cases}}\)

Answer 4

\(x^2=4\Rightarrow x=\sqrt{4}=2\)2 hoặc \(x=-\sqrt{4}=-2\)