Y=(a-2x)^2.x tìm đạo hàm

\[\begin{array}{l}
y = {\left( {a – 2x} \right)^2}x\\
\Rightarrow y’ = \left[ {{{\left( {a – 2x} \right)}^2}x} \right]’\\
= \left[ {{{\left( {a – 2x} \right)}^2}} \right]’x + x'{\left( {a – 2x} \right)^2}\\
= 2\left( {a – 2x} \right)\left( {a – 2x} \right)’x + {\left( {a – 2x} \right)^2}\\
= – 4x\left( {a – 2x} \right) + {\left( {a – 2x} \right)^2}.
\end{array}\]