Question

(x+5)²=9

phân tích ra các trường hợp riêng

Answer 1

\(\left(x+5\right)^2=9\\ =>\left[{}\begin{matrix}\left(x+5\right)^2=3^2\\\left(x+5\right)^2=\left(-3\right)^2\end{matrix}\right.=>\left[{}\begin{matrix}x+5=3\\x+5=-3\end{matrix}\right.=>\left[{}\begin{matrix}x=-2\\x=-8\end{matrix}\right.\)

Vậy \(x=-2;x=-8\)

Answer 2

`(x+5)^2=9`

`=>(x+5)^2=3^2=(-3)^2`

`@TH1:`

`x+5=3`

`=>x=3-5`

`=>x=-2`

`@TH2:`

`x+5=-3`

`=>x=-3-5`

`=>x=-8`

Answer 3

Answer 4

(x+5)²=9

<=>\(\left\{{}\begin{matrix}x+5=3\\x+5=-3\end{matrix}\right.\)

<=>\(\left\{{}\begin{matrix}x=3-5=-2\\x=-3-5=-8\end{matrix}\right.\)

Vậy x∈{-2;-8}