Question

X(x+2)=3

Answer 1

x=1 hoặc -3

 

Answer 2

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

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

\(x\left(x-1\right)+3\left(x-1\right)=0\)

\(\left(x+3\right)\left(x-1\right)=0\)

\(\left[{}\begin{matrix}x+3=0\\x-1=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-3\\x=1\end{matrix}\right.\)

Answer 3

\(\Rightarrow x=3\) hoặc \(x+2=3\)

\(\Rightarrow x=3\) hoặc \(x=1\)

Vậy x \(\in\left\{3;1\right\}\)

Answer 4

\(x\left(x+2\right)=3\)

\(\Leftrightarrow x^2+2x-3=0\)

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