Question 1138514
Find the derivative of {{{f(x) = -11/x}}}  at {{{x = 9}}}

{{{(d/dx)f(x) = 11/x^2}}}

 at {{{x = 9}}} will be

{{{(d/dx)f(x) = 11/9^2}}}

{{{(d/dx)f(x)= 11/81}}}