Question

Tìm x, biết:

2(x + 3) – x² – 3x = 0

Answer 1

\(\Rightarrow2\left(x+3\right)-x\left(x+3\right)=0\Rightarrow\left(x+3\right)\left(2-x\right)=0\)

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

Answer 2

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

Answer 3

2(x+3)-x(x+3)=0

x+3=0 hoặc 2-x=0

x=-3 hoặc x=2

Vậy \(x\in\left\{-3;2\right\}\)

Answer 4

x=-3, x=2