derivative

IF

$y=(4t-3)-8\\ y=4t-11\\ \frac{dy}{dt}=4\\~\\ BUT \;\;IF\\ y=(4t-3)^{-8}\\ \frac{dy}{dt}=-8(4t-3)^{-9}*4\\ \frac{dy}{dt}=-32(4t-3)^{-9}\\$