Question

[x+1]^2=16

Answer 1

\(\left(x+1\right)^2=16\\ \Rightarrow\left[{}\begin{matrix}x+1=4\\x+1=-4\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=3\\x=-5\end{matrix}\right.\)

Answer 2

\(\left(x+1\right)^2=16\\ \Rightarrow\left[{}\begin{matrix}x+1=4\\x+1=-4\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=3\\x=-5\end{matrix}\right.\)

Answer 3

\(\left(x+1\right)^2=4^2\)        hoặc            \(\left(x+1\right)^2=\left(-4^2\right)\)

\(=>x+1=4\)                            \(=>x+1=\left(-4\right)\)

\(x=4-1\)                                   \(x=-4-1\)

\(x=3\)                                         \(x=-5\)

Vậy \(x=3\) hoặc \(x=-5\)