## anonymous 5 years ago Calculate the derivative of the function. Then find the value of the derivative as specified. f(x) =8/x ; f'(-1)

$f(x)= 8/x = 8*x ^{-1}$ differentiate yields: $f \prime(x)= (-1)*8*x ^{-2} = -8/x ^{2}$ to find f'(-1), just substitute x=-1 in the derivative