Find the derivative of f(x) = -(9/x) at x = -8. How would I solve this?

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Find the derivative of f(x) = -(9/x) at x = -8. How would I solve this?

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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\[-(\frac{ 9 }{ x })=-9x^{-1}\] Then use the power rule \[\frac{ d }{ dx }x^n=nx^{n-1}\]
either use quotient rule or the power rule
Thanks guys. I think I get it

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alright :)
Can you tell me if I have the correct answer?
sure.
8/9?
let me check.. I"m going to use power rule as @peachpi did
|dw:1437794741135:dw|
9/64
You mean find the derivative, not find the derivation. They are not the same thing :)
got you
yeah ... if x = - 8|dw:1437794817385:dw|
whoa @zzr0ck3r scared me there XD

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