Question

Tìm x biết

2x(x - 3)+2x-6=0

Answer 1

2x(x-3) + 2x - 6 = 0

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

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

<=> \(\left[{}\begin{matrix}x-3=0\\2x+2=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=3\\x=-1\end{matrix}\right.\)

vậy............

Answer 2

Answer 3

Tìm x biết

2x.(x - 3) + 2x - 6 = 0

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

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

Suy ra: x - 3 = 0 hoặc 2x + 2 = 0

➢x - 3 = 0 _________ ➢2x + 2 = 0

⇒ x = 3 _________ ⇒ x = -1

Vậy x ∈ \(\left\{3;-1\right\}\)