Question

20 - 2(x - 1)²= 2

Answer 1

`20 - 2(x - 1)^2=2`

`=> 2(x - 1)^2=20-2`

`=> 2(x - 1)^2=18`

`=>(x - 1)^2=18:2`

`=>(x - 1)^2=9`

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

Answer 2

`20-2.(x-1)^2=2`

`2.(x-1)^2 = 20-2`

`2.(x-1)^2 =18`

`(x-1)^2=18:2`

`(x-1)^2 = 9`

`(x-1)^2=3^2`

`=>x-1=3` hoặc `x-1=-3`

`=>x=4` hoặc `x = -2`

Answer 3

20 - 2(x - 1)²= 2

2(x-1)²=20-2

2(x-1)²=18

(x-1)²=18:2

(x-1)²=9

(x-1)²=3²

x-1=3

x=3+1

x=4

 

 

Answer 4

\(< =>2\left(x-1\right)^2=20-2< =>2\left(x-1\right)^2=18< =>\left(x-1\right)^2=18:2< =>\left(x-1\right)^2=9< =>\left(x-1\right)^2=3^2\left[{}\begin{matrix}x-1=3\\x-1=-3\end{matrix}\right.< =>}\left[{}\begin{matrix}x=4\\x=-2\end{matrix}\right.\)