Question

(x+1)(y+1)=0

Answer 1

\(\left(x+1\right)\left(y+1\right)=0\)

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

Answer 2

\(\left(x+1\right)\left(y+1\right)=0\)

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

Vậy...............

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Answer 3

Vì \(\left(x+1\right)\left(y+1\right)=0\)

\(\Rightarrow x+1=0\) hoặc \(y+1=0\)

\(\Rightarrow x=-1;y=-1\)

Vậy \(\left(x;y\right)=\left(-1;-1\right)\)