Question

2(X+3)-x²-3X=0

Answer 1

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

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

=> 2-x=0 hoac x+3=0

=>x=2 hoac x=-3

Answer 2

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

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

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

=>\(\orbr{\begin{cases}2-x=0\\x+3=0\end{cases}\Rightarrow\orbr{\begin{cases}x=2\\x=-3\end{cases}}}\)

Answer 3

2(x + 3) - x² - 3x = 0

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

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

\(\Leftrightarrow\)\(\orbr{\begin{cases}2-x=0\\x+3=0\end{cases}}\)  \(\Leftrightarrow\) \(\orbr{\begin{cases}x=2\\x=-3\end{cases}}\)