anonymous
  • anonymous
The graph of the function has more than one turning point. Use the graphing calculator to find the coordinates of the turning point that lies in the given interval. f(x)= 7x^3 -9x^2 -x+1, [-1, 10] The coordinates of the turning point are
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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TuringTest
  • TuringTest
Is this calculus?
anonymous
  • anonymous
College Algebra
anonymous
  • anonymous
Find f'(x)

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TuringTest
  • TuringTest
The asker said algebra, so presumably that means no calculus allowed.
anonymous
  • anonymous
So what do I do?
TuringTest
  • TuringTest
it would certainly be a much easier calculus problem not sure I know a method for this using only algebra, I'll have to think on it...
anonymous
  • anonymous
ok
anonymous
  • anonymous
Graph it
TuringTest
  • TuringTest
that's all I can think of too
anonymous
  • anonymous
And the calculus way?
TuringTest
  • TuringTest
find x=a such that f'(a)=0
TuringTest
  • TuringTest
...in the given interval
anonymous
  • anonymous
http://www.wolframalpha.com/input/?i=plot+y%3D7x^3+-9x^2+-x%2B1
anonymous
  • anonymous
ok so what would the coordinates of the turning point?
anonymous
  • anonymous
It says "Use the graphing calculator to find the coordinates of the turning point that lies in the given interval"
TuringTest
  • TuringTest
wow I managed to not even read the post :P thanks cinar
anonymous
  • anonymous
I dont have one
anonymous
  • anonymous
(:
TuringTest
  • TuringTest
the website wolfram alpha is a pretty good one http://www.wolframalpha.com/
TuringTest
  • TuringTest
that site serves as a graphing calculator
anonymous
  • anonymous
laptop blocked it
anonymous
  • anonymous
http://answers.yahoo.com/question/index?qid=20091030113220AAieoZy
TuringTest
  • TuringTest
that method again requires calculus your three options are to buy the graphing calculator, get wolfram working on your laptop, or learn calculus besides that I have no ideas
anonymous
  • anonymous
I guess you have to use derivative
anonymous
  • anonymous
they are roughly (0.9,-2) (0.1,1) but exactly
anonymous
  • anonymous
It was (-0.05, 1.03)
anonymous
  • anonymous
http://www.wolframalpha.com/input/?i=max+y%3D7x^3+-9x^2+-x%2B1
TuringTest
  • TuringTest
wolfram disagrees o_O
anonymous
  • anonymous
http://www.wolframalpha.com/input/?i=min+y%3D7x^3+-9x^2+-x%2B1
anonymous
  • anonymous
that's right, I just used my eyes (:
anonymous
  • anonymous
(-0.05,1.03) and (0.91,-2.09) these are your answer..
anonymous
  • anonymous
I made typo for this they are roughly (0.9,-2) (0.1,1) but exactly

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