\(B\left(x\right)=2x^2-10x+12\)
\(B\left(x\right)=\left(2x^2-4x\right)-\left(6x-12\right)\)
\(B\left(x\right)=2x\left(x-2\right)-6\left(x-2\right)\)
\(B\left(x\right)=\left(2x-6\right)\left(x-2\right)\)
Mà : \(B\left(x\right)=0\)
\(\Rightarrow\left(2x-6\right)\left(x-2\right)=0\)
\(\Rightarrow\orbr{\begin{cases}2x-6=0\\x-2=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=3\\x=2\end{cases}}\)
Vậy x = 2 ; 3
Mik cảm ơn bạn nhìu nhen!!!!Thank you!!!!