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anonymous

  • one year ago

How would I solve this?

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  1. anonymous
    • one year ago
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  2. campbell_st
    • one year ago
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    start by rewriting the function in index form \[f(x) = \frac{-9}{x}~~~~or~~~~~f(x) = -9x^{-1}\] now you can find the derivative when you get the derivative just substitute x =12 and calculate an answer

  3. campbell_st
    • one year ago
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    or if you wait someone always gives the answer

  4. anonymous
    • one year ago
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    Thanks.

  5. anonymous
    • one year ago
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    Well how do I find the derivative, I'm not familiar with the process.

  6. anonymous
    • one year ago
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    @campbell_st

  7. campbell_st
    • one year ago
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    ok... well if you don't understand the process of differentiation, then it's extremely difficult to complete this question. so have you studied any calculus..?

  8. anonymous
    • one year ago
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    I do not understand differentiation that well, as I am self taught.

  9. campbell_st
    • one year ago
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    ok, well here are some good online notes that take you through the process and methods but the basic thing for your question, now it's rewritten is to use this if \[f(x) = ax^n\] then the derivative is \[f'(x) = n \times ax^{n -1}\] here are the notes http://tutorial.math.lamar.edu/Classes/CalcI/DerivativeIntro.aspx hope they help

  10. anonymous
    • one year ago
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    Thanks, you've been very helpful.

  11. anonymous
    • one year ago
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    @campbell_st

  12. anonymous
    • one year ago
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    I think it is 1/16 is that correct?

  13. campbell_st
    • one year ago
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    that's correct

  14. anonymous
    • one year ago
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    Thanks :)

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