Question

-x^2+2020x-2019=0

 

Answer 1

\(\Leftrightarrow x^2-2020x+2019=0\)

=>(x-1)(x-2019)=0

=>x=1 hoặc x=2019

Answer 2

\(-x^2+2020x-2019=0\)

\(\Leftrightarrow x^2-2020x+2019=0\)

\(\Leftrightarrow x^2-x-2019x+2019=0\)

\(\Leftrightarrow x\left(x-1\right)-2019\left(x-1\right)=0\)

\(\Leftrightarrow\left(x-1\right)\left(x-2019\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x-1=0\\x-2019=0\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=1\\x=2019\end{matrix}\right.\)