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How do I determine the derivative  of 4/x^4?

I got it to 4*(1/x^4) then 4*(1/4x^3) but it says the answer is -(16/x^5), how do I get to this answer?

 Jan 27, 2021
edited by Guest  Jan 27, 2021
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4 x-4     deriv is     -4 (4)   x-4-1)   = -16 x-5   = -16/ x5

 Jan 27, 2021

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