Question

Tìm x : 

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

Bài toán dễ đây 

Answer 1

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

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

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

Vậy \(x\in\left\{-5;-6\right\}\)

Answer 2

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

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

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

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

\(\Rightarrow x\in\left\{-6;-5\right\}\)

Answer 3

Answer 4

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

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

Vậy x= - 5 ; x = - 6

Answer 5

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

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

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

Vậy x thuộc {-5;-6}

Answer 6

Ta có : ( x  + 5 ) ( x + 6 )

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

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

Answer 7

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

=> x = 0 - 5

x = -5

=> x = 0 - 6

x = -6

vậy x = lần lượt là -5 ; -6