Question

Find the derivative of f(x) = -(9/x) at x = -8.

How would I solve this?

Answer 1

\[-(\frac{ 9 }{ x })=-9x^{-1}\]
Then use the power rule
\[\frac{ d }{ dx }x^n=nx^{n-1}\]

Answer 2

either use quotient rule or the power rule

Answer 3

Thanks guys. I think I get it

Answer 4

alright :)

Answer 5

Can you tell me if I have the correct answer?

Answer 6

sure.

Answer 7

8/9?

Answer 8

let me check.. I"m going to use power rule as @peachpi did