=> 3x^2-5x-2=0
=>x=2 hoặc x=-1/3
hok tốt
\(\left(x-2\right)+3x^2-6x=0\)
\(\left(x-2\right)+3x\left(x\right)-6x=0\)
\(\left(x-2\right)+3x\left(x\right)+3x\left(-2\right)=0\)
\(3x\left(x-2+x-2\right)=0\)
\(\Rightarrow\orbr{\begin{cases}3x=0\\\left(x-2\right)^2=0\end{cases}\Rightarrow\orbr{\begin{cases}x=0\\x-2=0\end{cases}\Rightarrow}\orbr{\begin{cases}x=0\\x=2\end{cases}}}\)
oh chỗ (x-2+x-2) sai r
\(x-2+x-2=0\)
\(x+x=0+2+2\)
\(2x=4\)
\(x=2\)
