Question

Answer 1

Tìm x ạ

Answer 2

a) \(\Rightarrow5x\left(x-4\right)=0\)

\(\Rightarrow\left[{}\begin{matrix}x=0\\x=4\end{matrix}\right.\)

b) \(\Rightarrow2x-6-15-x=0\Rightarrow x=21\)

Answer 3

\(a,\Leftrightarrow5x\left(x-4\right)=0\Leftrightarrow\left[{}\begin{matrix}x=0\\x=4\end{matrix}\right.\\ b,\Leftrightarrow2x-6=15+x\\ \Leftrightarrow x=21\)