Question

Please Help

Find the derivative of f(x) = -11/x at x = 9.

11/9
81/11
9/11
11/81

Answer 1

\[f(x)=-11x^{-1}\]\[f'(x)=11x^{-2}\]\[f'(9)=11(9)^{-2}\]

Answer 2

\[f'(9)=\frac{ 11 }{ 81 }\]

Answer 3

Thanks again! :)

Answer 4

np, again :)