Question

x.(x+7)=0

Answer 1

\(\Leftrightarrow\hept{\begin{cases}x=0\\x+7=0\end{cases}}\)\(\Leftrightarrow\hept{\begin{cases}x=0\\x=0-7\end{cases}}\)\(\Leftrightarrow\hept{\begin{cases}x=0\\x=-7\end{cases}}\)

Answer 2

x.(x+7)=0

(x+7)=0:x

(x+7)=0

x=0-7

x= -7 

k nhé

Answer 3

cảm ơn