I need to find the vertical tangents for this function

I got this for the derivative

I know to set the denominator equal to zero and from there I'm stuck

Thanks in advance!

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- September 23rd 2009, 03:31 PMredsox25Finding Vertical Tangent lines
I need to find the vertical tangents for this function

I got this for the derivative

I know to set the denominator equal to zero and from there I'm stuck

Thanks in advance! - September 23rd 2009, 03:38 PMskeeter
- September 23rd 2009, 03:41 PMredsox25
oops sorry about that

- September 23rd 2009, 04:08 PMskeeter
other than y = 0 , the other three zeros look to be irrational when graphed w/ a calculator. unless there's some clever trick, solving by hand may be rather messy.

http://www.math.vanderbilt.edu/~schectex/courses/cubic/