Question

Tìm x:

2x (x - 3) - x = -3

Answer 1

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

=>(x-3)(2x-1)=0

=>x=3 hoặc x=1/2

Answer 2

2x²-6x-x=-3

2x²-7x+3=0

=>\(\left\{{}\begin{matrix}x=3\\x=0,5\end{matrix}\right.\)

Answer 3

\(2x\left(x-3\right)-x=-3\\ \Leftrightarrow2x^2-6x-x+3=0\\ \Leftrightarrow2x^2-7x+3=0\\ \Leftrightarrow\left[{}\begin{matrix}x_1=3\\x_2=\dfrac{1}{2}\end{matrix}\right.\)

Answer 4

Đáp án

x=3

x=1/2