anonymous
  • anonymous
Find the derivative of f(x) = 8/x at x = -1.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
@dan815
anonymous
  • anonymous
do you know the power rule?
anonymous
  • anonymous
no sorry

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More answers

anonymous
  • anonymous
@Peaches15
anonymous
  • anonymous
here is if this helps f(x) = 8x^(-1) is the same thing as f(x) = 8/x
anonymous
  • anonymous
oh cool
anonymous
  • anonymous
now I know the power rule
anonymous
  • anonymous
so just bring the -1 down and subtract 1 from the exponent of -1
anonymous
  • anonymous
you make no sense lol
anonymous
  • anonymous
can you pls show me?
anonymous
  • anonymous
f(x) = x^6 • 7e^(7x) + e^(7x) • 6x^5 = e^(7x) (7x^6 + 6x^5) hope this help
anonymous
  • anonymous
yeah afcourse y = 8x^(-1) y'= (-1)8x^(-1-1) y' = -8x^(-2)
anonymous
  • anonymous
ok what does that do? how does that bring us closer to solving the problem. Pls just list the steps and how to do them for this problem and once I get it once I won't need help again. I will be your 2nd fan and give you medal
anonymous
  • anonymous
when you have negative exponents you can bring them to the denominator and then they become positive so youll get y' = -8/x^2
anonymous
  • anonymous
ok but how do i find the gosh darn derivative?
anonymous
  • anonymous
here plug in your problem into this calculator it shows steps and names the rules that you need to use itll explain it better than i could http://www.derivative-calculator.net/
anonymous
  • anonymous
y' = -8/x^2 is the derivative
anonymous
  • anonymous
oho thanks
anonymous
  • anonymous
see but these are my answers: 4 0 8 -8
anonymous
  • anonymous
@phi
anonymous
  • anonymous
yeah know you need to plug in the -1 remember from your x = -1 in the question
anonymous
  • anonymous
now*
anonymous
  • anonymous
ok thanks got it now

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