Question

x^2 = x

Answer 1

\(x^2=x\)

\(=>\left[{}\begin{matrix}x=1\\x=0\end{matrix}\right.\)

Answer 2

`@` `\text {Ans}`

`\downarrow`

`x^2 = x`

`=> x^2 - x = 0`

`=> x(x - 1) = 0`

`=>`\(\left[{}\begin{matrix}x=0\\x-1=0\end{matrix}\right.\)

`=>`\(\left[{}\begin{matrix}x=0\\x=1\end{matrix}\right.\)

Vậy, `x \in {0; 1}.`

Answer 3

\(x^2=x\\ \Rightarrow x^2-x=0\\ \Rightarrow x\left(x-1\right)=0\\ \Rightarrow\left[{}\begin{matrix}x=0\\x-1=0\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=0\\x=1\end{matrix}\right.\)