anonymous
  • anonymous
NEED HELP PLEASE...having problem solving. given the function f(x)=3x^3-9x^2-2, find the coordinates of all the critical points of the function.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
first differentiate
anonymous
  • anonymous
i did that and got 9x^2 - 18 = 0, but this where i'm stuck
anonymous
  • anonymous
i think the derivative of thefunction is not 9x^2 - 18 = 0, but 9x^2-18x=0 x^2-2x=0 x(x-2)=0 x=2 and x=0

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anonymous
  • anonymous
then plug the values of x to the function f(0) = -2 f(2)= 3(2)^3 -9(2)^2 -2 = 24-36-2 = -14 so the critical points is (0,-2) and (2,-14)
anonymous
  • anonymous
oh ok. i got that! thanx alot

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