Question

Tìm x:

( x - 12 )x( x + 3) = 0

Answer 1

( x - 12 ).( x + 3 ) = 0

\(\Rightarrow x-12=0\) hoặc \(x+3=0\)

+) \(x-12=0\Rightarrow x=12\)

+) \(x+3=0\Rightarrow x=-3\)

Vậy x = 12 hoặc x = -3

Answer 2

\(\left(x-12\right)\left(x+3\right)=0\)

\(\Rightarrow\left[\begin{array}{nghiempt}x-12=0\\x+3=0\end{array}\right.\)\(\Rightarrow\left[\begin{array}{nghiempt}x=12\\x=-3\end{array}\right.\)

Vậy x=12 ; x = - 3

Answer 3

(x-12)x(x+3)

Suy ra x-12=0;x=0;x+3=0

x-12=0

x=-12

x+3=0

x=-3

Vậy x=-12;x=0;x=-3

 

Answer 4

( x - 12 ).( x + 3 ) = 0

hoặc

+)

+)

Vậy x = 12 hoặc x = -3

Answer 5

(x-12).(x+3) = 0

⇒ x-12=0 hoặc x+3=0

Nếu :

x-12=0

x = 0+12

x = 12

Nếu :

x+3 = 0

x = 0-3

x = -3

Vậy x ∈ {-3; 12}