Question

Tìm x :

\(\left(x+5\right)\left(x+6\right)=0\)

Answer 1

Ta có : \(\left(x+5\right)\left(x+6\right)=0\)

\(\Leftrightarrow\left[\begin{array}{nghiempt}x+5=0\\x+6=0\end{array}\right.\Leftrightarrow\left[\begin{array}{nghiempt}x=-5\\x=-6\end{array}\right.\)

Vậy \(x\in\left\{-5;-6\right\}\)

Answer 2

@Minh Hieu Nguyen sai rồi

Phải có 2 trường hợp xảy ra

Answer 3

=>x=0

(0+5)(0+6)=0

Answer 4

=>x+5=0                      =>x=-5

    x+6=0                          x=-6

 

Answer 5

\(\left(x+5\right)\left(x+6\right)=0\)

\(\Rightarrow\begin{cases}x+5=0\\x+6=0\end{cases}\Rightarrow\begin{cases}x=-5\\x=-6\end{cases}\)