Question

b, (3-x).(5x+2)=0

Answer 1

=>3-x=0 hoặc 5x+2=0

=>x=-2/5 hoặc x=3

Answer 2

\(\left(3-x\right)\left(5x+2\right)=0\)

\(\Rightarrow\left[{}\begin{matrix}3-x=0\\5x+2=0\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=3\\x=\dfrac{-2}{5}\end{matrix}\right.\)