Question

(x - 7 ) . (x+3)<0

Answer 1

(x - 7).(x + 3) < 0

=> Có 2 trường hợp 

\(\left(1\right)\hept{\begin{cases}x-7< 0\\x+3>0\end{cases}\Rightarrow\hept{\begin{cases}x< 7\\x>-3\end{cases}\Rightarrow}-3< x< 7}\)

\(\left(2\right)\hept{\begin{cases}x-7>0\\x+3< 0\end{cases}\Rightarrow\hept{\begin{cases}x>7\\x< -3\end{cases}\Rightarrow}x\in O}\)

Vậy -3 < x < 7

Answer 2

x = -2 ; - 1 ; 0 ; 1 ; 2 ; 3 ; 4 ; 5 ; 6

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