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

Question

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

turingtest · Answer

Is this calculus?

anonymous · Answer

College Algebra

anonymous · Answer

Find f'(x)

turingtest · Answer

The asker said algebra, so presumably that means no calculus allowed.

anonymous · Answer

So what do I do?

turingtest · Answer

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 · Answer

ok

anonymous · Answer

Graph it

turingtest · Answer

that's all I can think of too

anonymous · Answer

And the calculus way?

turingtest · Answer

find x=a such that f'(a)=0

turingtest · Answer

...in the given interval

anonymous · Answer

http://www.wolframalpha.com/input/?i=plot+y%3D7x^3+-9x^2+-x%2B1

anonymous · Answer

ok so what would the coordinates of the turning point?

anonymous · Answer

It says "Use the graphing calculator to find the coordinates of the turning point that lies in the given interval"

turingtest · Answer

wow I managed to not even read the post :P
thanks cinar

anonymous · Answer

I dont have one

anonymous · Answer

(:

turingtest · Answer

the website wolfram alpha is a pretty good one http://www.wolframalpha.com/

turingtest · Answer

that site serves as a graphing calculator

anonymous · Answer

laptop blocked it

anonymous · Answer

http://answers.yahoo.com/question/index?qid=20091030113220AAieoZy

turingtest · Answer

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 · Answer

I guess you have to use derivative

anonymous · Answer

they are roughly (0.9,-2)  (0.1,1) but exactly

anonymous · Answer

It was (-0.05, 1.03)

anonymous · Answer

http://www.wolframalpha.com/input/?i=max+y%3D7x^3+-9x^2+-x%2B1

turingtest · Answer

wolfram disagrees o_O

anonymous · Answer

http://www.wolframalpha.com/input/?i=min+y%3D7x^3+-9x^2+-x%2B1

anonymous · Answer

that's right, I just used my eyes (:

anonymous · Answer

(-0.05,1.03) and (0.91,-2.09) these are your answer..

anonymous · Answer

I made typo for this they are roughly (0.9,-2) (0.1,1) but exactly