Graph Quadratic r = [-654+sqrt(654^2-4(9pi+36)(-9586))]]/(2*

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yellowmonster572

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Sep 12, 2007
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How would you graph the quadratic r = [-654 + sqrt(654^2 - 4(9pi+36)(-9586))] / (2*9pi+36)?
My math teacher is having us do it as an extra assignment, and I would like to know how to do it on Excel.
Please help
 
yellowmonster572 said:
How would you graph the quadratic r = [-654 + sqrt(654^2 - 4(9pi+36)(-9586))] / (2*9pi+36)?
Click to expand...
On what basis are you concluding that "r = (some constant)" is a quadratic function?

Please reply with clarification. Thank you! :D

Eliz.
 
Then you better check your post very very carefuly - and tell us whether it was correct.

As posted - it does not make sense. We suspect - you are missing some variable.

So repost the problem again - do not cut and paste.
 
On what basis are you concluding that "r = (some constant)" is a quadratic function?
Click to expand...
yellowmonster572 said:
It's the quadratic from a previous assignment.
Click to expand...
The expression for "r" may come from some other assignment, to which this question is a follow-up (and which should have been included, so we knew what you were talking about). But "r = (a constant)" is not, to my knowledge, any sort of "quadratic"; it's either a horizontal line (of the form "y = f(x) = b" in rectangular coordinates) or a circle (with radius "r" in polar coordinates).

Please reply with all of the missing information. Thank you! :D

Eliz.
 
Hmmm....looks to me that:

let k = 9pi + 36

equation was: kr^2 + 654r - 9586 = 0

then r = [-654 +- sqrt(654^2 - 4k(-9566))] / (2k)

That's where that intriguing(?) r comes from :idea:
 
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