# How do you find the derivative of y= (4x-x^2)^10 ?

$y ' = 10 {\left(4 x - {x}^{2}\right)}^{9} \cdot \left(4 - 2 x\right) = 20 \left(2 - x\right) {\left(4 x - {x}^{2}\right)}^{9}$