Question

|x^2-x|=-2x mất bạn k8 giúp mk vs

Answer 1

ĐKXĐ:\(x\le0\)

\(\left|x^2-x\right|=-2x\\ \Rightarrow\left[{}\begin{matrix}x^2-x=-2x\\x^2-x=2x\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x^2+x=0\\x^2-3x=0\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x\left(x+1\right)=0\\x\left(x-3\right)=0\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=0\left(tm\right)\\x=-1\left(tm\right)\\x=3\left(ktm\right)\end{matrix}\right.\)