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anonymous

  • 5 years ago

y= 1/ (7x-8)^5 find dxy

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  1. anonymous
    • 5 years ago
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    y = (7x-8)^-5...use the power rule... y' = -5/((7x-8)^6)

  2. anonymous
    • 5 years ago
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    answer on the book is -35/ (7x-8)^6 ?

  3. anonymous
    • 5 years ago
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    yes, sorry...chain rule...so multiply my answer above by derivative of 7x-8...so that gives -35/(7x-8)^6...

  4. anonymous
    • 5 years ago
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    can you explain how to do chain rule on this to get the answer?

  5. anonymous
    • 5 years ago
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    yes. first use the power rule by bringing down -5 and subtracting 1 from -5 giving the new exponent... -5(7x-8)^-6...then multiply that by the derivative of (7x-8)... -5(7x-8)^-6 * 7... -35(7x-8)^-6... -35/(7x-8)^6

  6. anonymous
    • 5 years ago
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    thank you very much.. your awsome

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