Question

4x²-4=0

Answer 1

`4x^2-4=0`

`<=>4(x^2-1)=0`

`<=>x^2-1=0`

`<=>x^2=1`

`<=>x=+-1`

Vậy `S={+-1}`

Answer 2

\(\Leftrightarrow4x^2=4\) 

\(\Leftrightarrow4x^2=2^2\) 

\(\Leftrightarrow4x=\pm2\)  

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

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

Vậy. .

Answer 3

4x^2-4=0

<=>4x^2=4

<=>x^2=4/4

<=>x^2=1

<=>x=căn 1÷1