Question

2x²+4x=0

 

Answer 1

\(2x\left(x+2\right)\)

\(=>\left[{}\begin{matrix}2x=0\\x+2=0\end{matrix}\right.=>\left[{}\begin{matrix}x=0\\x=-2\end{matrix}\right.\)

\(=>x\in\left\{0;-2\right\}\)

 

Answer 2

`2x^2+4x =0`

`2x(x+2)= 0`

`<=>x = 0` hoặc `x = -2`

Answer 3

\(2x^2+4x=0\\ \Leftrightarrow2x\left(x+2\right)=0\\\Leftrightarrow\left\{{}\begin{matrix}2x=0\\x+2=0\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}x=0\\x=-2\end{matrix}\right.\)

Vậy x=0 ;x=-2