If f(1) = 4 , f(2)=5, f(7) = 5 and f(8)=4, find the value of f(6).Also obtain the value of x for which f(x) is maximum or minumum.

I don't have a clue what to do

Results 1 to 5 of 5

- January 1st 2010, 11:42 PM #1

- Joined
- Dec 2009
- Posts
- 24

- January 2nd 2010, 12:00 AM #2

- Joined
- Jul 2009
- Posts
- 593
- Thanks
- 4

Is this the complete problem? I mean f(6) can be anything really; I am also assuming you are meant to notice that f(x) is continuous, and thus a local maximum must occur between f(5) and f(7) - or hell f(5) and f(7) could be the local maximum and the graph dips btween f(5) and f(7). I dunno, theres a lot that can be going on here. Is this all the information - was there a picture to go along with this question?

- January 2nd 2010, 12:50 AM #3

- Joined
- Nov 2005
- From
- someplace
- Posts
- 14,972
- Thanks
- 4

- January 2nd 2010, 05:34 AM #4

- Joined
- Dec 2009
- Posts
- 24

- January 2nd 2010, 09:27 AM #5

- Joined
- May 2006
- From
- Lexington, MA (USA)
- Posts
- 11,921
- Thanks
- 784

Hello, wolfyparadise!

It is a carelessly-worded problem.

As stated, there is an infinite number of possible answers.

If

Find the value of

Also find the value of x for which is maximum or minumum.

Code:| 5 + * * | : : 4 + * : : * | : : : : | : : : : | : : : : . . + - + - + - - - - + - + - - - - - | 1 2 7 - 8 |

From the symmetry, I wouldthat*guess*

. . we are expected to assume is a parabola.

The general parabola is: .

And we can determine that: .

Hence, the function is: .

Now you can answer their question . . .