Question

( x-2) (x+5)=0

Answer 1

\(\left(x-2\right)\left(x+5\right)=0\\ \Rightarrow\left[{}\begin{matrix}x-2=0\\x+5=0\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=2\\x=-5\end{matrix}\right.\)

Answer 2

\(\left(x-2\right)\left(x+5\right)=0\)

\(x-2=0\)

\(x+5=0\)

\(x=2\)

\(x=-5\)

Answer 3

x1= 2

x2= (1,2,3,4,5,6,7,....)

Answer 4

( x - 2 ) ( x + 5 ) = 0

⇔ x - 2 = 0 hoặc x + 5 = 0

     x      = 2 hoặc x       = - 5

Answer 5

\(\left[{}\begin{matrix}x=2\\x=-5\end{matrix}\right.\)

Answer 6

\(=>x-2-0=>x=2\)

       \(5+x=0=>x=-5\)

Vậy có 2 trường hợp:\(\left\{{}\begin{matrix}x=2\\x=-5\end{matrix}\right.\)