anonymous
  • anonymous
how do you find the abs max of func x^3-12x on the interval 0
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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amistre64
  • amistre64
take the first and second derivatives....
amistre64
  • amistre64
y = x^3 - 12x y' = 3x^2 - 12 y' = 0 will give critical points; y'' = 6x ; plug those points into y'' to see if they are (+) or (-) to find max and min
amistre64
  • amistre64
y' = 3x^2 - 12x = 0 x(3x - 12) = 0 when x = 0 or x = 4 are the critical points of your equation... but I have to wonder, does your interval INCLUDE 0 and 4? because the way you have it written it means everything between 0 and 4 EXCEPT for 0 and 4.

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anonymous
  • anonymous
yes it does so i just plug in 0 and 4 into the second deritave to find the max?
anonymous
  • anonymous
because the answer is 16 and i have no idea how that it
amistre64
  • amistre64
you plug it into the second derivative see how it "acts"; and according to its behaviour, there are a few possibilities of what it could be... But first, plug in 0 and 4 into your original equation to see what value they give..
amistre64
  • amistre64
y(0) = 0 y(4) = 16. 16 is obviously higher than 0
amistre64
  • amistre64
so that would be the maximium point within the interval....
anonymous
  • anonymous
thanks haha i feel dumb now i knew that

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