# How do you differentiate  y =(2 x^2 − 9)^(-9)  using the chain rule?

$y ' = \left(- 9\right) {\left(2 {x}^{2} - 9\right)}^{-} 10 \left(4 x\right)$
$y ' = - 36 x {\left(2 {x}^{2} - 9\right)}^{-} 10$