Question

tìm x biết :

x^2 + x - 6

Answer 1

Đề là : `x^{2}+x-6=0` phải kh bn ???

Answer 2

\(x^2+x-6=0\Leftrightarrow\left(x-2\right)\left(x+3\right)=0\Leftrightarrow\left[{}\begin{matrix}x-2=0\\x+3=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=2\\x=-3\end{matrix}\right.\)

Answer 3

Cho đa thức `=0`

`->x^{2}+x-6=0`

`->(x^{2}+3x)-(2x+6)=0`

`->x(x+3)-2(x+3)=0`

`->(x+3)(x-2)=0`

`->x+3=0` hay `x-2=0`

`->x=-3` hay `x=2`

Answer 4

Ta có: \(x^2+x-6=0\)

\(\Leftrightarrow\left(x+3\right)\left(x-2\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=-3\\x=2\end{matrix}\right.\)