Question

[Nguyễn Nhã Khanh]

(x+2)^2 = 4

Answer 1

[『Kuroba ム Tsuki Ryoo ︵²ᵏ⁷』]

`@` `\text {Ans}`

`\downarrow`

`(x+2)^2 = 4`

`=> (x+2)^2 = (+-2)^2`

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

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

`=>`\(\left[{}\begin{matrix}x=0\\x=-4\end{matrix}\right.\)

Vậy, `x \in {0; -4}.`

Answer 2

[Nguyễn Thị Thương Hoài]

(\(x\) + 2)² = 4

\(\left(x+2\right)^2\) = 2²

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

\(\left[{}\begin{matrix}x=0\\x=-4\end{matrix}\right.\)

vậy \(x\in\) \(\left\{-4;0\right\}\)