Question

Tìm x khi A= x²-2x+2 có giá trị bằng 2

Answer 1

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

Answer 2

\(A=2\Rightarrow x^2-2x+2=2\)

\(\Rightarrow\)\(x^2-2x=0\)

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

Answer 3