Question

Tìm x: \(30x-15x^2=0\)

Answer 1

\(30x-15x^2-0\)

\(\Leftrightarrow15x\left(2-x\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}15x=0\\2-x=0\end{matrix}\right.\)

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