Question

tìm số nguyên x biết

3x-17=x+3

(x-3)(2x+6)=0

Answer 1

\(3x-17=x+3\)

\(\Rightarrow3x-x=3+17\)

\(\Rightarrow2x=20\)

\(\Rightarrow x=10\)

\(\left(x-3\right)\left(2x+6\right)=0\)

\(\Leftrightarrow\orbr{\begin{cases}x-3=0\\2x+6=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=3\\x=-3\end{cases}}}\)

Answer 2

\(3x-17=x+3\)

\(3x-x=17+3\)

\(2x=20\)

\(x=10\)

Answer 3

\(\left(x-3\right)\left(2x+6\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x-3=0\\2x+6=0\end{cases}\Rightarrow}\orbr{\begin{cases}x=3\\x=-3\end{cases}}\)